projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
mwifiex: separate interface combination for multichannel and DFS
[deliverable/linux.git] / drivers / target / target_core_transport.c
CommitLineData
c66ac9db
NB		 1/*******************************************************************************
2 * Filename: target_core_transport.c
3 *
4 * This file contains the Generic Target Engine Core.
5 *
4c76251e 6 * (c) Copyright 2002-2013 Datera, Inc.
c66ac9db
NB		 7 *
8 * Nicholas A. Bellinger <nab@kernel.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 ******************************************************************************/
25
c66ac9db
NB		 26#include <linux/net.h>
27#include <linux/delay.h>
28#include <linux/string.h>
29#include <linux/timer.h>
30#include <linux/slab.h>
c66ac9db 31#include <linux/spinlock.h>
c66ac9db
NB		 32#include <linux/kthread.h>
33#include <linux/in.h>
34#include <linux/cdrom.h>
827509e3 35#include <linux/module.h>
015487b8 36#include <linux/ratelimit.h>
5538d294 37#include <linux/vmalloc.h>
c66ac9db
NB		 38#include <asm/unaligned.h>
39#include <net/sock.h>
40#include <net/tcp.h>
ba929992 41#include <scsi/scsi_proto.h>
c66ac9db
NB		 42
43#include <target/target_core_base.h>
c4795fb2
CH		 44#include <target/target_core_backend.h>
45#include <target/target_core_fabric.h>
c66ac9db
NB		 46#include <target/target_core_configfs.h>
47
e26d99ae 48#include "target_core_internal.h"
c66ac9db 49#include "target_core_alua.h"
c66ac9db 50#include "target_core_pr.h"
c66ac9db
NB		 51#include "target_core_ua.h"
52
e5c0d6ad
RD		 53#define CREATE_TRACE_POINTS
54#include <trace/events/target.h>
55
35e0e757 56static struct workqueue_struct *target_completion_wq;
c66ac9db 57static struct kmem_cache *se_sess_cache;
c66ac9db 58struct kmem_cache *se_ua_cache;
c66ac9db
NB		 59struct kmem_cache *t10_pr_reg_cache;
60struct kmem_cache *t10_alua_lu_gp_cache;
61struct kmem_cache *t10_alua_lu_gp_mem_cache;
62struct kmem_cache *t10_alua_tg_pt_gp_cache;
63struct kmem_cache *t10_alua_tg_pt_gp_mem_cache;
229d4f11
HR		 64struct kmem_cache *t10_alua_lba_map_cache;
65struct kmem_cache *t10_alua_lba_map_mem_cache;
c66ac9db 66
c66ac9db 67static void transport_complete_task_attr(struct se_cmd *cmd);
07bde79a 68static void transport_handle_queue_full(struct se_cmd *cmd,
e057f533 69 struct se_device *dev);
d5ddad41 70static int transport_put_cmd(struct se_cmd *cmd);
35e0e757 71static void target_complete_ok_work(struct work_struct *work);
c66ac9db 72
e3d6f909 73int init_se_kmem_caches(void)
c66ac9db 74{
c66ac9db
NB		 75 se_sess_cache = kmem_cache_create("se_sess_cache",
76 sizeof(struct se_session), __alignof__(struct se_session),
77 0, NULL);
6708bb27
AG		 78 if (!se_sess_cache) {
79 pr_err("kmem_cache_create() for struct se_session"
c66ac9db 80 " failed\n");
c8e31f26 81 goto out;
c66ac9db
NB		 82 }
83 se_ua_cache = kmem_cache_create("se_ua_cache",
84 sizeof(struct se_ua), __alignof__(struct se_ua),
85 0, NULL);
6708bb27
AG		 86 if (!se_ua_cache) {
87 pr_err("kmem_cache_create() for struct se_ua failed\n");
35e0e757 88 goto out_free_sess_cache;
c66ac9db 89 }
c66ac9db
NB		 90 t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache",
91 sizeof(struct t10_pr_registration),
92 __alignof__(struct t10_pr_registration), 0, NULL);
6708bb27
AG		 93 if (!t10_pr_reg_cache) {
94 pr_err("kmem_cache_create() for struct t10_pr_registration"
c66ac9db 95 " failed\n");
35e0e757 96 goto out_free_ua_cache;
c66ac9db
NB		 97 }
98 t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache",
99 sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp),
100 0, NULL);
6708bb27
AG		 101 if (!t10_alua_lu_gp_cache) {
102 pr_err("kmem_cache_create() for t10_alua_lu_gp_cache"
c66ac9db 103 " failed\n");
35e0e757 104 goto out_free_pr_reg_cache;
c66ac9db
NB		 105 }
106 t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache",
107 sizeof(struct t10_alua_lu_gp_member),
108 __alignof__(struct t10_alua_lu_gp_member), 0, NULL);
6708bb27
AG		 109 if (!t10_alua_lu_gp_mem_cache) {
110 pr_err("kmem_cache_create() for t10_alua_lu_gp_mem_"
c66ac9db 111 "cache failed\n");
35e0e757 112 goto out_free_lu_gp_cache;
c66ac9db
NB		 113 }
114 t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache",
115 sizeof(struct t10_alua_tg_pt_gp),
116 __alignof__(struct t10_alua_tg_pt_gp), 0, NULL);
6708bb27
AG		 117 if (!t10_alua_tg_pt_gp_cache) {
118 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 119 "cache failed\n");
35e0e757 120 goto out_free_lu_gp_mem_cache;
c66ac9db
NB		 121 }
122 t10_alua_tg_pt_gp_mem_cache = kmem_cache_create(
123 "t10_alua_tg_pt_gp_mem_cache",
124 sizeof(struct t10_alua_tg_pt_gp_member),
125 __alignof__(struct t10_alua_tg_pt_gp_member),
126 0, NULL);
6708bb27
AG		 127 if (!t10_alua_tg_pt_gp_mem_cache) {
128 pr_err("kmem_cache_create() for t10_alua_tg_pt_gp_"
c66ac9db 129 "mem_t failed\n");
35e0e757 130 goto out_free_tg_pt_gp_cache;
c66ac9db 131 }
229d4f11
HR		 132 t10_alua_lba_map_cache = kmem_cache_create(
133 "t10_alua_lba_map_cache",
134 sizeof(struct t10_alua_lba_map),
135 __alignof__(struct t10_alua_lba_map), 0, NULL);
136 if (!t10_alua_lba_map_cache) {
137 pr_err("kmem_cache_create() for t10_alua_lba_map_"
138 "cache failed\n");
139 goto out_free_tg_pt_gp_mem_cache;
140 }
141 t10_alua_lba_map_mem_cache = kmem_cache_create(
142 "t10_alua_lba_map_mem_cache",
143 sizeof(struct t10_alua_lba_map_member),
144 __alignof__(struct t10_alua_lba_map_member), 0, NULL);
145 if (!t10_alua_lba_map_mem_cache) {
146 pr_err("kmem_cache_create() for t10_alua_lba_map_mem_"
147 "cache failed\n");
148 goto out_free_lba_map_cache;
149 }
c66ac9db 150
35e0e757
CH		 151 target_completion_wq = alloc_workqueue("target_completion",
152 WQ_MEM_RECLAIM, 0);
153 if (!target_completion_wq)
229d4f11 154 goto out_free_lba_map_mem_cache;
35e0e757 155
c66ac9db 156 return 0;
35e0e757 157
229d4f11
HR		 158out_free_lba_map_mem_cache:
159 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
160out_free_lba_map_cache:
161 kmem_cache_destroy(t10_alua_lba_map_cache);
35e0e757
CH		 162out_free_tg_pt_gp_mem_cache:
163 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
164out_free_tg_pt_gp_cache:
165 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
166out_free_lu_gp_mem_cache:
167 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
168out_free_lu_gp_cache:
169 kmem_cache_destroy(t10_alua_lu_gp_cache);
170out_free_pr_reg_cache:
171 kmem_cache_destroy(t10_pr_reg_cache);
172out_free_ua_cache:
173 kmem_cache_destroy(se_ua_cache);
174out_free_sess_cache:
175 kmem_cache_destroy(se_sess_cache);
c66ac9db 176out:
e3d6f909 177 return -ENOMEM;
c66ac9db
NB		 178}
179
e3d6f909 180void release_se_kmem_caches(void)
c66ac9db 181{
35e0e757 182 destroy_workqueue(target_completion_wq);
c66ac9db
NB		 183 kmem_cache_destroy(se_sess_cache);
184 kmem_cache_destroy(se_ua_cache);
c66ac9db
NB		 185 kmem_cache_destroy(t10_pr_reg_cache);
186 kmem_cache_destroy(t10_alua_lu_gp_cache);
187 kmem_cache_destroy(t10_alua_lu_gp_mem_cache);
188 kmem_cache_destroy(t10_alua_tg_pt_gp_cache);
189 kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache);
229d4f11
HR		 190 kmem_cache_destroy(t10_alua_lba_map_cache);
191 kmem_cache_destroy(t10_alua_lba_map_mem_cache);
c66ac9db
NB		 192}
193
e3d6f909
AG		 194/* This code ensures unique mib indexes are handed out. */
195static DEFINE_SPINLOCK(scsi_mib_index_lock);
196static u32 scsi_mib_index[SCSI_INDEX_TYPE_MAX];
e89d15ee
NB		 197
198/*
199 * Allocate a new row index for the entry type specified
200 */
201u32 scsi_get_new_index(scsi_index_t type)
202{
203 u32 new_index;
204
e3d6f909 205 BUG_ON((type < 0) || (type >= SCSI_INDEX_TYPE_MAX));
e89d15ee 206
e3d6f909
AG		 207 spin_lock(&scsi_mib_index_lock);
208 new_index = ++scsi_mib_index[type];
209 spin_unlock(&scsi_mib_index_lock);
e89d15ee
NB		 210
211 return new_index;
212}
213
dbc5623e 214void transport_subsystem_check_init(void)
c66ac9db
NB		 215{
216 int ret;
283669d2 217 static int sub_api_initialized;
c66ac9db 218
dbc5623e
NB		 219 if (sub_api_initialized)
220 return;
221
c66ac9db
NB		 222 ret = request_module("target_core_iblock");
223 if (ret != 0)
6708bb27 224 pr_err("Unable to load target_core_iblock\n");
c66ac9db
NB		 225
226 ret = request_module("target_core_file");
227 if (ret != 0)
6708bb27 228 pr_err("Unable to load target_core_file\n");
c66ac9db
NB		 229
230 ret = request_module("target_core_pscsi");
231 if (ret != 0)
6708bb27 232 pr_err("Unable to load target_core_pscsi\n");
c66ac9db 233
7c9e7a6f
AG		 234 ret = request_module("target_core_user");
235 if (ret != 0)
236 pr_err("Unable to load target_core_user\n");
237
e3d6f909 238 sub_api_initialized = 1;
c66ac9db
NB		 239}
240
e70beee7 241struct se_session *transport_init_session(enum target_prot_op sup_prot_ops)
c66ac9db
NB		 242{
243 struct se_session *se_sess;
244
245 se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL);
6708bb27
AG		 246 if (!se_sess) {
247 pr_err("Unable to allocate struct se_session from"
c66ac9db
NB		 248 " se_sess_cache\n");
249 return ERR_PTR(-ENOMEM);
250 }
251 INIT_LIST_HEAD(&se_sess->sess_list);
252 INIT_LIST_HEAD(&se_sess->sess_acl_list);
a17f091d 253 INIT_LIST_HEAD(&se_sess->sess_cmd_list);
9b31a328 254 INIT_LIST_HEAD(&se_sess->sess_wait_list);
a17f091d 255 spin_lock_init(&se_sess->sess_cmd_lock);
41ac82b6 256 kref_init(&se_sess->sess_kref);
e70beee7 257 se_sess->sup_prot_ops = sup_prot_ops;
c66ac9db
NB		 258
259 return se_sess;
260}
261EXPORT_SYMBOL(transport_init_session);
262
c0add7fd
NB		 263int transport_alloc_session_tags(struct se_session *se_sess,
264 unsigned int tag_num, unsigned int tag_size)
265{
266 int rc;
267
8c7f6e9b
NB		 268 se_sess->sess_cmd_map = kzalloc(tag_num * tag_size,
269 GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
c0add7fd 270 if (!se_sess->sess_cmd_map) {
8c7f6e9b
NB		 271 se_sess->sess_cmd_map = vzalloc(tag_num * tag_size);
272 if (!se_sess->sess_cmd_map) {
273 pr_err("Unable to allocate se_sess->sess_cmd_map\n");
274 return -ENOMEM;
275 }
c0add7fd
NB		 276 }
277
278 rc = percpu_ida_init(&se_sess->sess_tag_pool, tag_num);
279 if (rc < 0) {
280 pr_err("Unable to init se_sess->sess_tag_pool,"
281 " tag_num: %u\n", tag_num);
de64d3a6 282 kvfree(se_sess->sess_cmd_map);
c0add7fd
NB		 283 se_sess->sess_cmd_map = NULL;
284 return -ENOMEM;
285 }
286
287 return 0;
288}
289EXPORT_SYMBOL(transport_alloc_session_tags);
290
291struct se_session *transport_init_session_tags(unsigned int tag_num,
e70beee7
NB		 292 unsigned int tag_size,
293 enum target_prot_op sup_prot_ops)
c0add7fd
NB		 294{
295 struct se_session *se_sess;
296 int rc;
297
e70beee7 298 se_sess = transport_init_session(sup_prot_ops);
c0add7fd
NB		 299 if (IS_ERR(se_sess))
300 return se_sess;
301
302 rc = transport_alloc_session_tags(se_sess, tag_num, tag_size);
303 if (rc < 0) {
304 transport_free_session(se_sess);
305 return ERR_PTR(-ENOMEM);
306 }
307
308 return se_sess;
309}
310EXPORT_SYMBOL(transport_init_session_tags);
311
c66ac9db 312/*
140854cb 313 * Called with spin_lock_irqsave(&struct se_portal_group->session_lock called.
c66ac9db
NB		 314 */
315void __transport_register_session(
316 struct se_portal_group *se_tpg,
317 struct se_node_acl *se_nacl,
318 struct se_session *se_sess,
319 void *fabric_sess_ptr)
320{
9ac8928e 321 const struct target_core_fabric_ops *tfo = se_tpg->se_tpg_tfo;
c66ac9db
NB		 322 unsigned char buf[PR_REG_ISID_LEN];
323
324 se_sess->se_tpg = se_tpg;
325 se_sess->fabric_sess_ptr = fabric_sess_ptr;
326 /*
327 * Used by struct se_node_acl's under ConfigFS to locate active se_session-t
328 *
329 * Only set for struct se_session's that will actually be moving I/O.
330 * eg: *NOT* discovery sessions.
331 */
332 if (se_nacl) {
bffb5128
NB		 333 /*
334 *
335 * Determine if fabric allows for T10-PI feature bits exposed to
336 * initiators for device backends with !dev->dev_attrib.pi_prot_type.
337 *
338 * If so, then always save prot_type on a per se_node_acl node
339 * basis and re-instate the previous sess_prot_type to avoid
340 * disabling PI from below any previously initiator side
341 * registered LUNs.
342 */
343 if (se_nacl->saved_prot_type)
344 se_sess->sess_prot_type = se_nacl->saved_prot_type;
345 else if (tfo->tpg_check_prot_fabric_only)
346 se_sess->sess_prot_type = se_nacl->saved_prot_type =
347 tfo->tpg_check_prot_fabric_only(se_tpg);
c66ac9db
NB		 348 /*
349 * If the fabric module supports an ISID based TransportID,
350 * save this value in binary from the fabric I_T Nexus now.
351 */
e3d6f909 352 if (se_tpg->se_tpg_tfo->sess_get_initiator_sid != NULL) {
c66ac9db 353 memset(&buf[0], 0, PR_REG_ISID_LEN);
e3d6f909 354 se_tpg->se_tpg_tfo->sess_get_initiator_sid(se_sess,
c66ac9db
NB		 355 &buf[0], PR_REG_ISID_LEN);
356 se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]);
357 }
afb999ff
NB		 358 kref_get(&se_nacl->acl_kref);
359
c66ac9db
NB		 360 spin_lock_irq(&se_nacl->nacl_sess_lock);
361 /*
362 * The se_nacl->nacl_sess pointer will be set to the
363 * last active I_T Nexus for each struct se_node_acl.
364 */
365 se_nacl->nacl_sess = se_sess;
366
367 list_add_tail(&se_sess->sess_acl_list,
368 &se_nacl->acl_sess_list);
369 spin_unlock_irq(&se_nacl->nacl_sess_lock);
370 }
371 list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list);
372
6708bb27 373 pr_debug("TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n",
e3d6f909 374 se_tpg->se_tpg_tfo->get_fabric_name(), se_sess->fabric_sess_ptr);
c66ac9db
NB		 375}
376EXPORT_SYMBOL(__transport_register_session);
377
378void transport_register_session(
379 struct se_portal_group *se_tpg,
380 struct se_node_acl *se_nacl,
381 struct se_session *se_sess,
382 void *fabric_sess_ptr)
383{
140854cb
NB		 384 unsigned long flags;
385
386 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db 387 __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr);
140854cb 388 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 389}
390EXPORT_SYMBOL(transport_register_session);
391
ecf0dd66 392static void target_release_session(struct kref *kref)
41ac82b6
NB		 393{
394 struct se_session *se_sess = container_of(kref,
395 struct se_session, sess_kref);
396 struct se_portal_group *se_tpg = se_sess->se_tpg;
397
398 se_tpg->se_tpg_tfo->close_session(se_sess);
399}
400
401void target_get_session(struct se_session *se_sess)
402{
403 kref_get(&se_sess->sess_kref);
404}
405EXPORT_SYMBOL(target_get_session);
406
33933a0e 407void target_put_session(struct se_session *se_sess)
41ac82b6 408{
4149268e
JE		 409 struct se_portal_group *tpg = se_sess->se_tpg;
410
411 if (tpg->se_tpg_tfo->put_session != NULL) {
412 tpg->se_tpg_tfo->put_session(se_sess);
413 return;
414 }
33933a0e 415 kref_put(&se_sess->sess_kref, target_release_session);
41ac82b6
NB		 416}
417EXPORT_SYMBOL(target_put_session);
418
f8e471f9
NB		 419ssize_t target_show_dynamic_sessions(struct se_portal_group *se_tpg, char *page)
420{
421 struct se_session *se_sess;
422 ssize_t len = 0;
423
424 spin_lock_bh(&se_tpg->session_lock);
425 list_for_each_entry(se_sess, &se_tpg->tpg_sess_list, sess_list) {
426 if (!se_sess->se_node_acl)
427 continue;
428 if (!se_sess->se_node_acl->dynamic_node_acl)
429 continue;
430 if (strlen(se_sess->se_node_acl->initiatorname) + 1 + len > PAGE_SIZE)
431 break;
432
433 len += snprintf(page + len, PAGE_SIZE - len, "%s\n",
434 se_sess->se_node_acl->initiatorname);
435 len += 1; /* Include NULL terminator */
436 }
437 spin_unlock_bh(&se_tpg->session_lock);
438
439 return len;
440}
441EXPORT_SYMBOL(target_show_dynamic_sessions);
442
afb999ff
NB		 443static void target_complete_nacl(struct kref *kref)
444{
445 struct se_node_acl *nacl = container_of(kref,
446 struct se_node_acl, acl_kref);
447
448 complete(&nacl->acl_free_comp);
449}
450
451void target_put_nacl(struct se_node_acl *nacl)
452{
453 kref_put(&nacl->acl_kref, target_complete_nacl);
454}
455
c66ac9db
NB		 456void transport_deregister_session_configfs(struct se_session *se_sess)
457{
458 struct se_node_acl *se_nacl;
23388864 459 unsigned long flags;
c66ac9db
NB		 460 /*
461 * Used by struct se_node_acl's under ConfigFS to locate active struct se_session
462 */
463 se_nacl = se_sess->se_node_acl;
6708bb27 464 if (se_nacl) {
23388864 465 spin_lock_irqsave(&se_nacl->nacl_sess_lock, flags);
337c0607
NB		 466 if (se_nacl->acl_stop == 0)
467 list_del(&se_sess->sess_acl_list);
c66ac9db
NB		 468 /*
469 * If the session list is empty, then clear the pointer.
470 * Otherwise, set the struct se_session pointer from the tail
471 * element of the per struct se_node_acl active session list.
472 */
473 if (list_empty(&se_nacl->acl_sess_list))
474 se_nacl->nacl_sess = NULL;
475 else {
476 se_nacl->nacl_sess = container_of(
477 se_nacl->acl_sess_list.prev,
478 struct se_session, sess_acl_list);
479 }
23388864 480 spin_unlock_irqrestore(&se_nacl->nacl_sess_lock, flags);
c66ac9db
NB		 481 }
482}
483EXPORT_SYMBOL(transport_deregister_session_configfs);
484
485void transport_free_session(struct se_session *se_sess)
486{
c0add7fd
NB		 487 if (se_sess->sess_cmd_map) {
488 percpu_ida_destroy(&se_sess->sess_tag_pool);
de64d3a6 489 kvfree(se_sess->sess_cmd_map);
c0add7fd 490 }
c66ac9db
NB		 491 kmem_cache_free(se_sess_cache, se_sess);
492}
493EXPORT_SYMBOL(transport_free_session);
494
495void transport_deregister_session(struct se_session *se_sess)
496{
497 struct se_portal_group *se_tpg = se_sess->se_tpg;
9ac8928e 498 const struct target_core_fabric_ops *se_tfo;
c66ac9db 499 struct se_node_acl *se_nacl;
e63a8e19 500 unsigned long flags;
01468346 501 bool comp_nacl = true;
c66ac9db 502
6708bb27 503 if (!se_tpg) {
c66ac9db
NB		 504 transport_free_session(se_sess);
505 return;
506 }
01468346 507 se_tfo = se_tpg->se_tpg_tfo;
c66ac9db 508
e63a8e19 509 spin_lock_irqsave(&se_tpg->session_lock, flags);
c66ac9db
NB		 510 list_del(&se_sess->sess_list);
511 se_sess->se_tpg = NULL;
512 se_sess->fabric_sess_ptr = NULL;
e63a8e19 513 spin_unlock_irqrestore(&se_tpg->session_lock, flags);
c66ac9db
NB		 514
515 /*
516 * Determine if we need to do extra work for this initiator node's
517 * struct se_node_acl if it had been previously dynamically generated.
518 */
519 se_nacl = se_sess->se_node_acl;
01468346
NB		 520
521 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
522 if (se_nacl && se_nacl->dynamic_node_acl) {
523 if (!se_tfo->tpg_check_demo_mode_cache(se_tpg)) {
524 list_del(&se_nacl->acl_list);
525 se_tpg->num_node_acls--;
526 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
527 core_tpg_wait_for_nacl_pr_ref(se_nacl);
528 core_free_device_list_for_node(se_nacl, se_tpg);
529 se_tfo->tpg_release_fabric_acl(se_tpg, se_nacl);
530
531 comp_nacl = false;
532 spin_lock_irqsave(&se_tpg->acl_node_lock, flags);
c66ac9db 533 }
c66ac9db 534 }
01468346 535 spin_unlock_irqrestore(&se_tpg->acl_node_lock, flags);
c66ac9db 536
6708bb27 537 pr_debug("TARGET_CORE[%s]: Deregistered fabric_sess\n",
e3d6f909 538 se_tpg->se_tpg_tfo->get_fabric_name());
01468346 539 /*
125d0119 540 * If last kref is dropping now for an explicit NodeACL, awake sleeping
afb999ff
NB		 541 * ->acl_free_comp caller to wakeup configfs se_node_acl->acl_group
542 * removal context.
01468346 543 */
0bcc297e 544 if (se_nacl && comp_nacl)
afb999ff 545 target_put_nacl(se_nacl);
01468346 546
afb999ff 547 transport_free_session(se_sess);
c66ac9db
NB		 548}
549EXPORT_SYMBOL(transport_deregister_session);
550
551/*
a1d8b49a 552 * Called with cmd->t_state_lock held.
c66ac9db 553 */
cf572a96 554static void target_remove_from_state_list(struct se_cmd *cmd)
c66ac9db 555{
42bf829e 556 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 557 unsigned long flags;
558
42bf829e
CH		 559 if (!dev)
560 return;
c66ac9db 561
cf572a96
CH		 562 if (cmd->transport_state & CMD_T_BUSY)
563 return;
c66ac9db 564
cf572a96
CH		 565 spin_lock_irqsave(&dev->execute_task_lock, flags);
566 if (cmd->state_active) {
567 list_del(&cmd->state_list);
cf572a96 568 cmd->state_active = false;
c66ac9db 569 }
cf572a96 570 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 571}
572
862e6389
NB		 573static int transport_cmd_check_stop(struct se_cmd *cmd, bool remove_from_lists,
574 bool write_pending)
c66ac9db
NB		 575{
576 unsigned long flags;
577
a1d8b49a 578 spin_lock_irqsave(&cmd->t_state_lock, flags);
862e6389
NB		 579 if (write_pending)
580 cmd->t_state = TRANSPORT_WRITE_PENDING;
581
f7113a47
CH		 582 if (remove_from_lists) {
583 target_remove_from_state_list(cmd);
584
585 /*
586 * Clear struct se_cmd->se_lun before the handoff to FE.
587 */
588 cmd->se_lun = NULL;
589 }
590
c66ac9db
NB		 591 /*
592 * Determine if frontend context caller is requesting the stopping of
e3d6f909 593 * this command for frontend exceptions.
c66ac9db 594 */
7d680f3b
CH		 595 if (cmd->transport_state & CMD_T_STOP) {
596 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
597 __func__, __LINE__,
e3d6f909 598 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 599
a1d8b49a 600 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 601
a95d6511 602 complete_all(&cmd->t_transport_stop_comp);
c66ac9db
NB		 603 return 1;
604 }
f7113a47
CH		 605
606 cmd->transport_state &= ~CMD_T_ACTIVE;
607 if (remove_from_lists) {
608 /*
609 * Some fabric modules like tcm_loop can release
610 * their internally allocated I/O reference now and
611 * struct se_cmd now.
612 *
613 * Fabric modules are expected to return '1' here if the
614 * se_cmd being passed is released at this point,
615 * or zero if not being released.
616 */
617 if (cmd->se_tfo->check_stop_free != NULL) {
618 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
619 return cmd->se_tfo->check_stop_free(cmd);
c66ac9db 620 }
f7113a47 621 }
c66ac9db 622
a1d8b49a 623 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 624 return 0;
625}
626
627static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd)
628{
862e6389 629 return transport_cmd_check_stop(cmd, true, false);
c66ac9db
NB		 630}
631
632static void transport_lun_remove_cmd(struct se_cmd *cmd)
633{
e3d6f909 634 struct se_lun *lun = cmd->se_lun;
c66ac9db 635
5259a06e 636 if (!lun)
c66ac9db
NB		 637 return;
638
5259a06e
NB		 639 if (cmpxchg(&cmd->lun_ref_active, true, false))
640 percpu_ref_put(&lun->lun_ref);
c66ac9db
NB		 641}
642
643void transport_cmd_finish_abort(struct se_cmd *cmd, int remove)
644{
68259b5a
AL		 645 if (cmd->se_cmd_flags & SCF_SE_LUN_CMD)
646 transport_lun_remove_cmd(cmd);
131e6abc
NB		 647 /*
648 * Allow the fabric driver to unmap any resources before
649 * releasing the descriptor via TFO->release_cmd()
650 */
651 if (remove)
652 cmd->se_tfo->aborted_task(cmd);
68259b5a 653
c66ac9db
NB		 654 if (transport_cmd_check_stop_to_fabric(cmd))
655 return;
af877292 656 if (remove)
e6a2573f 657 transport_put_cmd(cmd);
c66ac9db
NB		 658}
659
35e0e757
CH		 660static void target_complete_failure_work(struct work_struct *work)
661{
662 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
663
de103c93
CH		 664 transport_generic_request_failure(cmd,
665 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE);
35e0e757
CH		 666}
667
6138ed2a 668/*
d5829eac
PB		 669 * Used when asking transport to copy Sense Data from the underlying
670 * Linux/SCSI struct scsi_cmnd
6138ed2a 671 */
d5829eac 672static unsigned char *transport_get_sense_buffer(struct se_cmd *cmd)
6138ed2a 673{
6138ed2a 674 struct se_device *dev = cmd->se_dev;
6138ed2a
PB		 675
676 WARN_ON(!cmd->se_lun);
677
678 if (!dev)
d5829eac 679 return NULL;
6138ed2a 680
d5829eac
PB		 681 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION)
682 return NULL;
6138ed2a 683
9c58b7dd 684 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
6138ed2a 685
d5829eac 686 pr_debug("HBA_[%u]_PLUG[%s]: Requesting sense for SAM STATUS: 0x%02x\n",
6138ed2a 687 dev->se_hba->hba_id, dev->transport->name, cmd->scsi_status);
9c58b7dd 688 return cmd->sense_buffer;
6138ed2a
PB		 689}
690
5787cacd 691void target_complete_cmd(struct se_cmd *cmd, u8 scsi_status)
c66ac9db 692{
42bf829e 693 struct se_device *dev = cmd->se_dev;
5787cacd 694 int success = scsi_status == GOOD;
c66ac9db 695 unsigned long flags;
c66ac9db 696
5787cacd
CH		 697 cmd->scsi_status = scsi_status;
698
699
a1d8b49a 700 spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96 701 cmd->transport_state &= ~CMD_T_BUSY;
c66ac9db 702
c66ac9db 703 if (dev && dev->transport->transport_complete) {
d5829eac
PB		 704 dev->transport->transport_complete(cmd,
705 cmd->t_data_sg,
706 transport_get_sense_buffer(cmd));
707 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE)
c66ac9db 708 success = 1;
c66ac9db
NB		 709 }
710
711 /*
5787cacd 712 * See if we are waiting to complete for an exception condition.
c66ac9db 713 */
cf572a96 714 if (cmd->transport_state & CMD_T_REQUEST_STOP) {
a1d8b49a 715 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
cf572a96 716 complete(&cmd->task_stop_comp);
c66ac9db
NB		 717 return;
718 }
2235007c 719
3d28934a 720 /*
125d0119 721 * Check for case where an explicit ABORT_TASK has been received
3d28934a
NB		 722 * and transport_wait_for_tasks() will be waiting for completion..
723 */
724 if (cmd->transport_state & CMD_T_ABORTED &&
725 cmd->transport_state & CMD_T_STOP) {
726 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a95d6511 727 complete_all(&cmd->t_transport_stop_comp);
3d28934a 728 return;
3dca1471 729 } else if (!success) {
35e0e757 730 INIT_WORK(&cmd->work, target_complete_failure_work);
c66ac9db 731 } else {
35e0e757 732 INIT_WORK(&cmd->work, target_complete_ok_work);
c66ac9db 733 }
35e0e757 734
35e0e757 735 cmd->t_state = TRANSPORT_COMPLETE;
3d28934a 736 cmd->transport_state |= (CMD_T_COMPLETE | CMD_T_ACTIVE);
a1d8b49a 737 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 738
35e0e757 739 queue_work(target_completion_wq, &cmd->work);
c66ac9db 740}
6bb35e00
CH		 741EXPORT_SYMBOL(target_complete_cmd);
742
2426bd45
RD		 743void target_complete_cmd_with_length(struct se_cmd *cmd, u8 scsi_status, int length)
744{
745 if (scsi_status == SAM_STAT_GOOD && length < cmd->data_length) {
746 if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
747 cmd->residual_count += cmd->data_length - length;
748 } else {
749 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
750 cmd->residual_count = cmd->data_length - length;
751 }
752
753 cmd->data_length = length;
754 }
755
756 target_complete_cmd(cmd, scsi_status);
757}
758EXPORT_SYMBOL(target_complete_cmd_with_length);
759
cf572a96 760static void target_add_to_state_list(struct se_cmd *cmd)
c66ac9db 761{
cf572a96
CH		 762 struct se_device *dev = cmd->se_dev;
763 unsigned long flags;
c66ac9db 764
cf572a96
CH		 765 spin_lock_irqsave(&dev->execute_task_lock, flags);
766 if (!cmd->state_active) {
767 list_add_tail(&cmd->state_list, &dev->state_list);
768 cmd->state_active = true;
c66ac9db 769 }
cf572a96 770 spin_unlock_irqrestore(&dev->execute_task_lock, flags);
c66ac9db
NB		 771}
772
07bde79a 773/*
f147abb4 774 * Handle QUEUE_FULL / -EAGAIN and -ENOMEM status
07bde79a 775 */
7a6f0a1e
CH		 776static void transport_write_pending_qf(struct se_cmd *cmd);
777static void transport_complete_qf(struct se_cmd *cmd);
07bde79a 778
0fd97ccf 779void target_qf_do_work(struct work_struct *work)
07bde79a
NB		 780{
781 struct se_device *dev = container_of(work, struct se_device,
782 qf_work_queue);
bcac364a 783 LIST_HEAD(qf_cmd_list);
07bde79a
NB		 784 struct se_cmd *cmd, *cmd_tmp;
785
786 spin_lock_irq(&dev->qf_cmd_lock);
bcac364a
RD		 787 list_splice_init(&dev->qf_cmd_list, &qf_cmd_list);
788 spin_unlock_irq(&dev->qf_cmd_lock);
07bde79a 789
bcac364a 790 list_for_each_entry_safe(cmd, cmd_tmp, &qf_cmd_list, se_qf_node) {
07bde79a 791 list_del(&cmd->se_qf_node);
33940d09 792 atomic_dec_mb(&dev->dev_qf_count);
07bde79a 793
6708bb27 794 pr_debug("Processing %s cmd: %p QUEUE_FULL in work queue"
07bde79a 795 " context: %s\n", cmd->se_tfo->get_fabric_name(), cmd,
e057f533 796 (cmd->t_state == TRANSPORT_COMPLETE_QF_OK) ? "COMPLETE_OK" :
07bde79a
NB		 797 (cmd->t_state == TRANSPORT_COMPLETE_QF_WP) ? "WRITE_PENDING"
798 : "UNKNOWN");
f7a5cc0b 799
7a6f0a1e
CH		 800 if (cmd->t_state == TRANSPORT_COMPLETE_QF_WP)
801 transport_write_pending_qf(cmd);
802 else if (cmd->t_state == TRANSPORT_COMPLETE_QF_OK)
803 transport_complete_qf(cmd);
07bde79a 804 }
07bde79a
NB		 805}
806
c66ac9db
NB		 807unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd)
808{
809 switch (cmd->data_direction) {
810 case DMA_NONE:
811 return "NONE";
812 case DMA_FROM_DEVICE:
813 return "READ";
814 case DMA_TO_DEVICE:
815 return "WRITE";
816 case DMA_BIDIRECTIONAL:
817 return "BIDI";
818 default:
819 break;
820 }
821
822 return "UNKNOWN";
823}
824
825void transport_dump_dev_state(
826 struct se_device *dev,
827 char *b,
828 int *bl)
829{
830 *bl += sprintf(b + *bl, "Status: ");
0fd97ccf 831 if (dev->export_count)
c66ac9db 832 *bl += sprintf(b + *bl, "ACTIVATED");
0fd97ccf 833 else
c66ac9db 834 *bl += sprintf(b + *bl, "DEACTIVATED");
c66ac9db 835
5f41a31d 836 *bl += sprintf(b + *bl, " Max Queue Depth: %d", dev->queue_depth);
11e764bd 837 *bl += sprintf(b + *bl, " SectorSize: %u HwMaxSectors: %u\n",
0fd97ccf
CH		 838 dev->dev_attrib.block_size,
839 dev->dev_attrib.hw_max_sectors);
c66ac9db
NB		 840 *bl += sprintf(b + *bl, " ");
841}
842
c66ac9db
NB		 843void transport_dump_vpd_proto_id(
844 struct t10_vpd *vpd,
845 unsigned char *p_buf,
846 int p_buf_len)
847{
848 unsigned char buf[VPD_TMP_BUF_SIZE];
849 int len;
850
851 memset(buf, 0, VPD_TMP_BUF_SIZE);
852 len = sprintf(buf, "T10 VPD Protocol Identifier: ");
853
854 switch (vpd->protocol_identifier) {
855 case 0x00:
856 sprintf(buf+len, "Fibre Channel\n");
857 break;
858 case 0x10:
859 sprintf(buf+len, "Parallel SCSI\n");
860 break;
861 case 0x20:
862 sprintf(buf+len, "SSA\n");
863 break;
864 case 0x30:
865 sprintf(buf+len, "IEEE 1394\n");
866 break;
867 case 0x40:
868 sprintf(buf+len, "SCSI Remote Direct Memory Access"
869 " Protocol\n");
870 break;
871 case 0x50:
872 sprintf(buf+len, "Internet SCSI (iSCSI)\n");
873 break;
874 case 0x60:
875 sprintf(buf+len, "SAS Serial SCSI Protocol\n");
876 break;
877 case 0x70:
878 sprintf(buf+len, "Automation/Drive Interface Transport"
879 " Protocol\n");
880 break;
881 case 0x80:
882 sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n");
883 break;
884 default:
885 sprintf(buf+len, "Unknown 0x%02x\n",
886 vpd->protocol_identifier);
887 break;
888 }
889
890 if (p_buf)
891 strncpy(p_buf, buf, p_buf_len);
892 else
6708bb27 893 pr_debug("%s", buf);
c66ac9db
NB		 894}
895
896void
897transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83)
898{
899 /*
900 * Check if the Protocol Identifier Valid (PIV) bit is set..
901 *
902 * from spc3r23.pdf section 7.5.1
903 */
904 if (page_83[1] & 0x80) {
905 vpd->protocol_identifier = (page_83[0] & 0xf0);
906 vpd->protocol_identifier_set = 1;
907 transport_dump_vpd_proto_id(vpd, NULL, 0);
908 }
909}
910EXPORT_SYMBOL(transport_set_vpd_proto_id);
911
912int transport_dump_vpd_assoc(
913 struct t10_vpd *vpd,
914 unsigned char *p_buf,
915 int p_buf_len)
916{
917 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 918 int ret = 0;
919 int len;
c66ac9db
NB		 920
921 memset(buf, 0, VPD_TMP_BUF_SIZE);
922 len = sprintf(buf, "T10 VPD Identifier Association: ");
923
924 switch (vpd->association) {
925 case 0x00:
926 sprintf(buf+len, "addressed logical unit\n");
927 break;
928 case 0x10:
929 sprintf(buf+len, "target port\n");
930 break;
931 case 0x20:
932 sprintf(buf+len, "SCSI target device\n");
933 break;
934 default:
935 sprintf(buf+len, "Unknown 0x%02x\n", vpd->association);
e3d6f909 936 ret = -EINVAL;
c66ac9db
NB		 937 break;
938 }
939
940 if (p_buf)
941 strncpy(p_buf, buf, p_buf_len);
942 else
6708bb27 943 pr_debug("%s", buf);
c66ac9db
NB		 944
945 return ret;
946}
947
948int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83)
949{
950 /*
951 * The VPD identification association..
952 *
953 * from spc3r23.pdf Section 7.6.3.1 Table 297
954 */
955 vpd->association = (page_83[1] & 0x30);
956 return transport_dump_vpd_assoc(vpd, NULL, 0);
957}
958EXPORT_SYMBOL(transport_set_vpd_assoc);
959
960int transport_dump_vpd_ident_type(
961 struct t10_vpd *vpd,
962 unsigned char *p_buf,
963 int p_buf_len)
964{
965 unsigned char buf[VPD_TMP_BUF_SIZE];
e3d6f909
AG		 966 int ret = 0;
967 int len;
c66ac9db
NB		 968
969 memset(buf, 0, VPD_TMP_BUF_SIZE);
970 len = sprintf(buf, "T10 VPD Identifier Type: ");
971
972 switch (vpd->device_identifier_type) {
973 case 0x00:
974 sprintf(buf+len, "Vendor specific\n");
975 break;
976 case 0x01:
977 sprintf(buf+len, "T10 Vendor ID based\n");
978 break;
979 case 0x02:
980 sprintf(buf+len, "EUI-64 based\n");
981 break;
982 case 0x03:
983 sprintf(buf+len, "NAA\n");
984 break;
985 case 0x04:
986 sprintf(buf+len, "Relative target port identifier\n");
987 break;
988 case 0x08:
989 sprintf(buf+len, "SCSI name string\n");
990 break;
991 default:
992 sprintf(buf+len, "Unsupported: 0x%02x\n",
993 vpd->device_identifier_type);
e3d6f909 994 ret = -EINVAL;
c66ac9db
NB		 995 break;
996 }
997
e3d6f909
AG		 998 if (p_buf) {
999 if (p_buf_len < strlen(buf)+1)
1000 return -EINVAL;
c66ac9db 1001 strncpy(p_buf, buf, p_buf_len);
e3d6f909 1002 } else {
6708bb27 1003 pr_debug("%s", buf);
e3d6f909 1004 }
c66ac9db
NB		 1005
1006 return ret;
1007}
1008
1009int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83)
1010{
1011 /*
1012 * The VPD identifier type..
1013 *
1014 * from spc3r23.pdf Section 7.6.3.1 Table 298
1015 */
1016 vpd->device_identifier_type = (page_83[1] & 0x0f);
1017 return transport_dump_vpd_ident_type(vpd, NULL, 0);
1018}
1019EXPORT_SYMBOL(transport_set_vpd_ident_type);
1020
1021int transport_dump_vpd_ident(
1022 struct t10_vpd *vpd,
1023 unsigned char *p_buf,
1024 int p_buf_len)
1025{
1026 unsigned char buf[VPD_TMP_BUF_SIZE];
1027 int ret = 0;
1028
1029 memset(buf, 0, VPD_TMP_BUF_SIZE);
1030
1031 switch (vpd->device_identifier_code_set) {
1032 case 0x01: /* Binary */
703d641d
DC		 1033 snprintf(buf, sizeof(buf),
1034 "T10 VPD Binary Device Identifier: %s\n",
c66ac9db
NB		 1035 &vpd->device_identifier[0]);
1036 break;
1037 case 0x02: /* ASCII */
703d641d
DC		 1038 snprintf(buf, sizeof(buf),
1039 "T10 VPD ASCII Device Identifier: %s\n",
c66ac9db
NB		 1040 &vpd->device_identifier[0]);
1041 break;
1042 case 0x03: /* UTF-8 */
703d641d
DC		 1043 snprintf(buf, sizeof(buf),
1044 "T10 VPD UTF-8 Device Identifier: %s\n",
c66ac9db
NB		 1045 &vpd->device_identifier[0]);
1046 break;
1047 default:
1048 sprintf(buf, "T10 VPD Device Identifier encoding unsupported:"
1049 " 0x%02x", vpd->device_identifier_code_set);
e3d6f909 1050 ret = -EINVAL;
c66ac9db
NB		 1051 break;
1052 }
1053
1054 if (p_buf)
1055 strncpy(p_buf, buf, p_buf_len);
1056 else
6708bb27 1057 pr_debug("%s", buf);
c66ac9db
NB		 1058
1059 return ret;
1060}
1061
1062int
1063transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83)
1064{
1065 static const char hex_str[] = "0123456789abcdef";
35d1efe8 1066 int j = 0, i = 4; /* offset to start of the identifier */
c66ac9db
NB		 1067
1068 /*
1069 * The VPD Code Set (encoding)
1070 *
1071 * from spc3r23.pdf Section 7.6.3.1 Table 296
1072 */
1073 vpd->device_identifier_code_set = (page_83[0] & 0x0f);
1074 switch (vpd->device_identifier_code_set) {
1075 case 0x01: /* Binary */
1076 vpd->device_identifier[j++] =
1077 hex_str[vpd->device_identifier_type];
1078 while (i < (4 + page_83[3])) {
1079 vpd->device_identifier[j++] =
1080 hex_str[(page_83[i] & 0xf0) >> 4];
1081 vpd->device_identifier[j++] =
1082 hex_str[page_83[i] & 0x0f];
1083 i++;
1084 }
1085 break;
1086 case 0x02: /* ASCII */
1087 case 0x03: /* UTF-8 */
1088 while (i < (4 + page_83[3]))
1089 vpd->device_identifier[j++] = page_83[i++];
1090 break;
1091 default:
1092 break;
1093 }
1094
1095 return transport_dump_vpd_ident(vpd, NULL, 0);
1096}
1097EXPORT_SYMBOL(transport_set_vpd_ident);
1098
de103c93
CH		 1099sense_reason_t
1100target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
9b3b8041
CH		 1101{
1102 struct se_device *dev = cmd->se_dev;
1103
1104 if (cmd->unknown_data_length) {
1105 cmd->data_length = size;
1106 } else if (size != cmd->data_length) {
1107 pr_warn("TARGET_CORE[%s]: Expected Transfer Length:"
1108 " %u does not match SCSI CDB Length: %u for SAM Opcode:"
1109 " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
1110 cmd->data_length, size, cmd->t_task_cdb[0]);
1111
9b3b8041
CH		 1112 if (cmd->data_direction == DMA_TO_DEVICE) {
1113 pr_err("Rejecting underflow/overflow"
1114 " WRITE data\n");
de103c93 1115 return TCM_INVALID_CDB_FIELD;
9b3b8041
CH		 1116 }
1117 /*
1118 * Reject READ_* or WRITE_* with overflow/underflow for
1119 * type SCF_SCSI_DATA_CDB.
1120 */
0fd97ccf 1121 if (dev->dev_attrib.block_size != 512) {
9b3b8041
CH		 1122 pr_err("Failing OVERFLOW/UNDERFLOW for LBA op"
1123 " CDB on non 512-byte sector setup subsystem"
1124 " plugin: %s\n", dev->transport->name);
1125 /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */
de103c93 1126 return TCM_INVALID_CDB_FIELD;
9b3b8041 1127 }
4c054ba6
NB		 1128 /*
1129 * For the overflow case keep the existing fabric provided
1130 * ->data_length. Otherwise for the underflow case, reset
1131 * ->data_length to the smaller SCSI expected data transfer
1132 * length.
1133 */
9b3b8041
CH		 1134 if (size > cmd->data_length) {
1135 cmd->se_cmd_flags |= SCF_OVERFLOW_BIT;
1136 cmd->residual_count = (size - cmd->data_length);
1137 } else {
1138 cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
1139 cmd->residual_count = (cmd->data_length - size);
4c054ba6 1140 cmd->data_length = size;
9b3b8041 1141 }
9b3b8041
CH		 1142 }
1143
1144 return 0;
1145
9b3b8041
CH		 1146}
1147
c66ac9db
NB		 1148/*
1149 * Used by fabric modules containing a local struct se_cmd within their
1150 * fabric dependent per I/O descriptor.
1151 */
1152void transport_init_se_cmd(
1153 struct se_cmd *cmd,
9ac8928e 1154 const struct target_core_fabric_ops *tfo,
c66ac9db
NB		 1155 struct se_session *se_sess,
1156 u32 data_length,
1157 int data_direction,
1158 int task_attr,
1159 unsigned char *sense_buffer)
1160{
5951146d 1161 INIT_LIST_HEAD(&cmd->se_delayed_node);
07bde79a 1162 INIT_LIST_HEAD(&cmd->se_qf_node);
a17f091d 1163 INIT_LIST_HEAD(&cmd->se_cmd_list);
cf572a96 1164 INIT_LIST_HEAD(&cmd->state_list);
a1d8b49a 1165 init_completion(&cmd->t_transport_stop_comp);
a17f091d 1166 init_completion(&cmd->cmd_wait_comp);
cf572a96 1167 init_completion(&cmd->task_stop_comp);
a1d8b49a 1168 spin_lock_init(&cmd->t_state_lock);
1e1110c4 1169 kref_init(&cmd->cmd_kref);
7d680f3b 1170 cmd->transport_state = CMD_T_DEV_ACTIVE;
c66ac9db
NB		 1171
1172 cmd->se_tfo = tfo;
1173 cmd->se_sess = se_sess;
1174 cmd->data_length = data_length;
1175 cmd->data_direction = data_direction;
1176 cmd->sam_task_attr = task_attr;
1177 cmd->sense_buffer = sense_buffer;
cf572a96
CH		 1178
1179 cmd->state_active = false;
c66ac9db
NB		 1180}
1181EXPORT_SYMBOL(transport_init_se_cmd);
1182
de103c93
CH		 1183static sense_reason_t
1184transport_check_alloc_task_attr(struct se_cmd *cmd)
c66ac9db 1185{
019c4ca6
CH		 1186 struct se_device *dev = cmd->se_dev;
1187
c66ac9db
NB		 1188 /*
1189 * Check if SAM Task Attribute emulation is enabled for this
1190 * struct se_device storage object
1191 */
a3541703 1192 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
c66ac9db
NB		 1193 return 0;
1194
68d81f40 1195 if (cmd->sam_task_attr == TCM_ACA_TAG) {
6708bb27 1196 pr_debug("SAM Task Attribute ACA"
c66ac9db 1197 " emulation is not supported\n");
de103c93 1198 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1199 }
1200 /*
1201 * Used to determine when ORDERED commands should go from
1202 * Dormant to Active status.
1203 */
019c4ca6 1204 cmd->se_ordered_id = atomic_inc_return(&dev->dev_ordered_id);
6708bb27 1205 pr_debug("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n",
c66ac9db 1206 cmd->se_ordered_id, cmd->sam_task_attr,
019c4ca6 1207 dev->transport->name);
c66ac9db
NB		 1208 return 0;
1209}
1210
de103c93
CH		 1211sense_reason_t
1212target_setup_cmd_from_cdb(struct se_cmd *cmd, unsigned char *cdb)
c66ac9db 1213{
0fd97ccf 1214 struct se_device *dev = cmd->se_dev;
de103c93 1215 sense_reason_t ret;
c66ac9db 1216
c66ac9db
NB		 1217 /*
1218 * Ensure that the received CDB is less than the max (252 + 8) bytes
1219 * for VARIABLE_LENGTH_CMD
1220 */
1221 if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) {
6708bb27 1222 pr_err("Received SCSI CDB with command_size: %d that"
c66ac9db
NB		 1223 " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n",
1224 scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE);
de103c93 1225 return TCM_INVALID_CDB_FIELD;
c66ac9db
NB		 1226 }
1227 /*
1228 * If the received CDB is larger than TCM_MAX_COMMAND_SIZE,
1229 * allocate the additional extended CDB buffer now.. Otherwise
1230 * setup the pointer from __t_task_cdb to t_task_cdb.
1231 */
a1d8b49a
AG		 1232 if (scsi_command_size(cdb) > sizeof(cmd->__t_task_cdb)) {
1233 cmd->t_task_cdb = kzalloc(scsi_command_size(cdb),
c66ac9db 1234 GFP_KERNEL);
6708bb27
AG		 1235 if (!cmd->t_task_cdb) {
1236 pr_err("Unable to allocate cmd->t_task_cdb"
a1d8b49a 1237 " %u > sizeof(cmd->__t_task_cdb): %lu ops\n",
c66ac9db 1238 scsi_command_size(cdb),
a1d8b49a 1239 (unsigned long)sizeof(cmd->__t_task_cdb));
de103c93 1240 return TCM_OUT_OF_RESOURCES;
c66ac9db
NB		 1241 }
1242 } else
a1d8b49a 1243 cmd->t_task_cdb = &cmd->__t_task_cdb[0];
c66ac9db 1244 /*
a1d8b49a 1245 * Copy the original CDB into cmd->
c66ac9db 1246 */
a1d8b49a 1247 memcpy(cmd->t_task_cdb, cdb, scsi_command_size(cdb));
cb4f4d3c 1248
e5c0d6ad
RD		 1249 trace_target_sequencer_start(cmd);
1250
cb4f4d3c
CH		 1251 /*
1252 * Check for an existing UNIT ATTENTION condition
1253 */
de103c93
CH		 1254 ret = target_scsi3_ua_check(cmd);
1255 if (ret)
1256 return ret;
cb4f4d3c 1257
c87fbd56 1258 ret = target_alua_state_check(cmd);
de103c93
CH		 1259 if (ret)
1260 return ret;
cb4f4d3c 1261
d977f437 1262 ret = target_check_reservation(cmd);
f85eda8d
NB		 1263 if (ret) {
1264 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
d977f437 1265 return ret;
f85eda8d 1266 }
cb4f4d3c 1267
0fd97ccf 1268 ret = dev->transport->parse_cdb(cmd);
de103c93
CH		 1269 if (ret)
1270 return ret;
1271
1272 ret = transport_check_alloc_task_attr(cmd);
1273 if (ret)
c66ac9db 1274 return ret;
cb4f4d3c 1275
cb4f4d3c 1276 cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE;
cb4f4d3c 1277
c66ac9db
NB		 1278 spin_lock(&cmd->se_lun->lun_sep_lock);
1279 if (cmd->se_lun->lun_sep)
1280 cmd->se_lun->lun_sep->sep_stats.cmd_pdus++;
1281 spin_unlock(&cmd->se_lun->lun_sep_lock);
1282 return 0;
1283}
a12f41f8 1284EXPORT_SYMBOL(target_setup_cmd_from_cdb);
c66ac9db 1285
695434e1
NB		 1286/*
1287 * Used by fabric module frontends to queue tasks directly.
1288 * Many only be used from process context only
1289 */
1290int transport_handle_cdb_direct(
1291 struct se_cmd *cmd)
1292{
de103c93 1293 sense_reason_t ret;
dd8ae59d 1294
695434e1
NB		 1295 if (!cmd->se_lun) {
1296 dump_stack();
6708bb27 1297 pr_err("cmd->se_lun is NULL\n");
695434e1
NB		 1298 return -EINVAL;
1299 }
1300 if (in_interrupt()) {
1301 dump_stack();
6708bb27 1302 pr_err("transport_generic_handle_cdb cannot be called"
695434e1
NB		 1303 " from interrupt context\n");
1304 return -EINVAL;
1305 }
dd8ae59d 1306 /*
af877292
CH		 1307 * Set TRANSPORT_NEW_CMD state and CMD_T_ACTIVE to ensure that
1308 * outstanding descriptors are handled correctly during shutdown via
1309 * transport_wait_for_tasks()
dd8ae59d
NB		 1310 *
1311 * Also, we don't take cmd->t_state_lock here as we only expect
1312 * this to be called for initial descriptor submission.
1313 */
1314 cmd->t_state = TRANSPORT_NEW_CMD;
7d680f3b
CH		 1315 cmd->transport_state |= CMD_T_ACTIVE;
1316
dd8ae59d
NB		 1317 /*
1318 * transport_generic_new_cmd() is already handling QUEUE_FULL,
1319 * so follow TRANSPORT_NEW_CMD processing thread context usage
1320 * and call transport_generic_request_failure() if necessary..
1321 */
1322 ret = transport_generic_new_cmd(cmd);
de103c93
CH		 1323 if (ret)
1324 transport_generic_request_failure(cmd, ret);
dd8ae59d 1325 return 0;
695434e1
NB		 1326}
1327EXPORT_SYMBOL(transport_handle_cdb_direct);
1328
c5ff8d6b 1329sense_reason_t
de103c93
CH		 1330transport_generic_map_mem_to_cmd(struct se_cmd *cmd, struct scatterlist *sgl,
1331 u32 sgl_count, struct scatterlist *sgl_bidi, u32 sgl_bidi_count)
1332{
1333 if (!sgl || !sgl_count)
1334 return 0;
1335
1336 /*
1337 * Reject SCSI data overflow with map_mem_to_cmd() as incoming
1338 * scatterlists already have been set to follow what the fabric
1339 * passes for the original expected data transfer length.
1340 */
1341 if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
1342 pr_warn("Rejecting SCSI DATA overflow for fabric using"
1343 " SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC\n");
1344 return TCM_INVALID_CDB_FIELD;
1345 }
1346
1347 cmd->t_data_sg = sgl;
1348 cmd->t_data_nents = sgl_count;
1349
1350 if (sgl_bidi && sgl_bidi_count) {
1351 cmd->t_bidi_data_sg = sgl_bidi;
1352 cmd->t_bidi_data_nents = sgl_bidi_count;
1353 }
1354 cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC;
1355 return 0;
1356}
1357
a026757f
NB		 1358/*
1359 * target_submit_cmd_map_sgls - lookup unpacked lun and submit uninitialized
1360 * se_cmd + use pre-allocated SGL memory.
a6360785
NB		 1361 *
1362 * @se_cmd: command descriptor to submit
1363 * @se_sess: associated se_sess for endpoint
1364 * @cdb: pointer to SCSI CDB
1365 * @sense: pointer to SCSI sense buffer
1366 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1367 * @data_length: fabric expected data transfer length
1368 * @task_addr: SAM task attribute
1369 * @data_dir: DMA data direction
1370 * @flags: flags for command submission from target_sc_flags_tables
a026757f
NB		 1371 * @sgl: struct scatterlist memory for unidirectional mapping
1372 * @sgl_count: scatterlist count for unidirectional mapping
1373 * @sgl_bidi: struct scatterlist memory for bidirectional READ mapping
1374 * @sgl_bidi_count: scatterlist count for bidirectional READ mapping
def2b339
NB		 1375 * @sgl_prot: struct scatterlist memory protection information
1376 * @sgl_prot_count: scatterlist count for protection information
a6360785 1377 *
d6dfc868
RD		 1378 * Returns non zero to signal active I/O shutdown failure. All other
1379 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1380 * but still return zero here.
1381 *
a6360785
NB		 1382 * This may only be called from process context, and also currently
1383 * assumes internal allocation of fabric payload buffer by target-core.
a026757f
NB		 1384 */
1385int target_submit_cmd_map_sgls(struct se_cmd *se_cmd, struct se_session *se_sess,
a6360785 1386 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
a026757f
NB		 1387 u32 data_length, int task_attr, int data_dir, int flags,
1388 struct scatterlist *sgl, u32 sgl_count,
def2b339
NB		 1389 struct scatterlist *sgl_bidi, u32 sgl_bidi_count,
1390 struct scatterlist *sgl_prot, u32 sgl_prot_count)
a6360785
NB		 1391{
1392 struct se_portal_group *se_tpg;
de103c93
CH		 1393 sense_reason_t rc;
1394 int ret;
a6360785
NB		 1395
1396 se_tpg = se_sess->se_tpg;
1397 BUG_ON(!se_tpg);
1398 BUG_ON(se_cmd->se_tfo || se_cmd->se_sess);
1399 BUG_ON(in_interrupt());
1400 /*
1401 * Initialize se_cmd for target operation. From this point
1402 * exceptions are handled by sending exception status via
1403 * target_core_fabric_ops->queue_status() callback
1404 */
1405 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
1406 data_length, data_dir, task_attr, sense);
b0d79946
SAS		 1407 if (flags & TARGET_SCF_UNKNOWN_SIZE)
1408 se_cmd->unknown_data_length = 1;
a6360785
NB		 1409 /*
1410 * Obtain struct se_cmd->cmd_kref reference and add new cmd to
1411 * se_sess->sess_cmd_list. A second kref_get here is necessary
1412 * for fabrics using TARGET_SCF_ACK_KREF that expect a second
1413 * kref_put() to happen during fabric packet acknowledgement.
1414 */
de103c93
CH		 1415 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1416 if (ret)
1417 return ret;
a6360785
NB		 1418 /*
1419 * Signal bidirectional data payloads to target-core
1420 */
1421 if (flags & TARGET_SCF_BIDI_OP)
1422 se_cmd->se_cmd_flags |= SCF_BIDI;
1423 /*
1424 * Locate se_lun pointer and attach it to struct se_cmd
1425 */
de103c93
CH		 1426 rc = transport_lookup_cmd_lun(se_cmd, unpacked_lun);
1427 if (rc) {
1428 transport_send_check_condition_and_sense(se_cmd, rc, 0);
735703ca 1429 target_put_sess_cmd(se_sess, se_cmd);
d6dfc868 1430 return 0;
735703ca 1431 }
b5b8e298
SG		 1432
1433 rc = target_setup_cmd_from_cdb(se_cmd, cdb);
1434 if (rc != 0) {
1435 transport_generic_request_failure(se_cmd, rc);
1436 return 0;
1437 }
1438
def2b339
NB		 1439 /*
1440 * Save pointers for SGLs containing protection information,
1441 * if present.
1442 */
1443 if (sgl_prot_count) {
1444 se_cmd->t_prot_sg = sgl_prot;
1445 se_cmd->t_prot_nents = sgl_prot_count;
1446 }
d6e0175c 1447
a026757f
NB		 1448 /*
1449 * When a non zero sgl_count has been passed perform SGL passthrough
1450 * mapping for pre-allocated fabric memory instead of having target
1451 * core perform an internal SGL allocation..
1452 */
1453 if (sgl_count != 0) {
1454 BUG_ON(!sgl);
1455
944981c7
NB		 1456 /*
1457 * A work-around for tcm_loop as some userspace code via
1458 * scsi-generic do not memset their associated read buffers,
1459 * so go ahead and do that here for type non-data CDBs. Also
1460 * note that this is currently guaranteed to be a single SGL
1461 * for this case by target core in target_setup_cmd_from_cdb()
1462 * -> transport_generic_cmd_sequencer().
1463 */
1464 if (!(se_cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) &&
1465 se_cmd->data_direction == DMA_FROM_DEVICE) {
1466 unsigned char *buf = NULL;
1467
1468 if (sgl)
1469 buf = kmap(sg_page(sgl)) + sgl->offset;
1470
1471 if (buf) {
1472 memset(buf, 0, sgl->length);
1473 kunmap(sg_page(sgl));
1474 }
1475 }
1476
a026757f
NB		 1477 rc = transport_generic_map_mem_to_cmd(se_cmd, sgl, sgl_count,
1478 sgl_bidi, sgl_bidi_count);
1479 if (rc != 0) {
de103c93 1480 transport_generic_request_failure(se_cmd, rc);
a026757f
NB		 1481 return 0;
1482 }
1483 }
def2b339 1484
11e319ed
AG		 1485 /*
1486 * Check if we need to delay processing because of ALUA
1487 * Active/NonOptimized primary access state..
1488 */
1489 core_alua_check_nonop_delay(se_cmd);
1490
a6360785 1491 transport_handle_cdb_direct(se_cmd);
d6dfc868 1492 return 0;
a6360785 1493}
a026757f
NB		 1494EXPORT_SYMBOL(target_submit_cmd_map_sgls);
1495
1496/*
1497 * target_submit_cmd - lookup unpacked lun and submit uninitialized se_cmd
1498 *
1499 * @se_cmd: command descriptor to submit
1500 * @se_sess: associated se_sess for endpoint
1501 * @cdb: pointer to SCSI CDB
1502 * @sense: pointer to SCSI sense buffer
1503 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1504 * @data_length: fabric expected data transfer length
1505 * @task_addr: SAM task attribute
1506 * @data_dir: DMA data direction
1507 * @flags: flags for command submission from target_sc_flags_tables
1508 *
1509 * Returns non zero to signal active I/O shutdown failure. All other
1510 * setup exceptions will be returned as a SCSI CHECK_CONDITION response,
1511 * but still return zero here.
1512 *
1513 * This may only be called from process context, and also currently
1514 * assumes internal allocation of fabric payload buffer by target-core.
1515 *
1516 * It also assumes interal target core SGL memory allocation.
1517 */
1518int target_submit_cmd(struct se_cmd *se_cmd, struct se_session *se_sess,
1519 unsigned char *cdb, unsigned char *sense, u32 unpacked_lun,
1520 u32 data_length, int task_attr, int data_dir, int flags)
1521{
1522 return target_submit_cmd_map_sgls(se_cmd, se_sess, cdb, sense,
1523 unpacked_lun, data_length, task_attr, data_dir,
def2b339 1524 flags, NULL, 0, NULL, 0, NULL, 0);
a026757f 1525}
a6360785
NB		 1526EXPORT_SYMBOL(target_submit_cmd);
1527
9f0d05c2
NB		 1528static void target_complete_tmr_failure(struct work_struct *work)
1529{
1530 struct se_cmd *se_cmd = container_of(work, struct se_cmd, work);
1531
1532 se_cmd->se_tmr_req->response = TMR_LUN_DOES_NOT_EXIST;
1533 se_cmd->se_tfo->queue_tm_rsp(se_cmd);
5a3b6fc0
RD		 1534
1535 transport_cmd_check_stop_to_fabric(se_cmd);
9f0d05c2
NB		 1536}
1537
ea98d7f9
AG		 1538/**
1539 * target_submit_tmr - lookup unpacked lun and submit uninitialized se_cmd
1540 * for TMR CDBs
1541 *
1542 * @se_cmd: command descriptor to submit
1543 * @se_sess: associated se_sess for endpoint
1544 * @sense: pointer to SCSI sense buffer
1545 * @unpacked_lun: unpacked LUN to reference for struct se_lun
1546 * @fabric_context: fabric context for TMR req
1547 * @tm_type: Type of TM request
c0974f89
NB		 1548 * @gfp: gfp type for caller
1549 * @tag: referenced task tag for TMR_ABORT_TASK
c7042cae 1550 * @flags: submit cmd flags
ea98d7f9
AG		 1551 *
1552 * Callable from all contexts.
1553 **/
1554
c7042cae 1555int target_submit_tmr(struct se_cmd *se_cmd, struct se_session *se_sess,
ea98d7f9 1556 unsigned char *sense, u32 unpacked_lun,
c0974f89
NB		 1557 void *fabric_tmr_ptr, unsigned char tm_type,
1558 gfp_t gfp, unsigned int tag, int flags)
ea98d7f9
AG		 1559{
1560 struct se_portal_group *se_tpg;
1561 int ret;
1562
1563 se_tpg = se_sess->se_tpg;
1564 BUG_ON(!se_tpg);
1565
1566 transport_init_se_cmd(se_cmd, se_tpg->se_tpg_tfo, se_sess,
68d81f40 1567 0, DMA_NONE, TCM_SIMPLE_TAG, sense);
c7042cae
NB		 1568 /*
1569 * FIXME: Currently expect caller to handle se_cmd->se_tmr_req
1570 * allocation failure.
1571 */
c0974f89 1572 ret = core_tmr_alloc_req(se_cmd, fabric_tmr_ptr, tm_type, gfp);
c7042cae
NB		 1573 if (ret < 0)
1574 return -ENOMEM;
ea98d7f9 1575
c0974f89
NB		 1576 if (tm_type == TMR_ABORT_TASK)
1577 se_cmd->se_tmr_req->ref_task_tag = tag;
1578
ea98d7f9 1579 /* See target_submit_cmd for commentary */
bc187ea6
RD		 1580 ret = target_get_sess_cmd(se_sess, se_cmd, (flags & TARGET_SCF_ACK_KREF));
1581 if (ret) {
1582 core_tmr_release_req(se_cmd->se_tmr_req);
1583 return ret;
1584 }
ea98d7f9 1585
ea98d7f9
AG		 1586 ret = transport_lookup_tmr_lun(se_cmd, unpacked_lun);
1587 if (ret) {
9f0d05c2
NB		 1588 /*
1589 * For callback during failure handling, push this work off
1590 * to process context with TMR_LUN_DOES_NOT_EXIST status.
1591 */
1592 INIT_WORK(&se_cmd->work, target_complete_tmr_failure);
1593 schedule_work(&se_cmd->work);
c7042cae 1594 return 0;
ea98d7f9
AG		 1595 }
1596 transport_generic_handle_tmr(se_cmd);
c7042cae 1597 return 0;
ea98d7f9
AG		 1598}
1599EXPORT_SYMBOL(target_submit_tmr);
1600
cdbb70bb 1601/*
cf572a96 1602 * If the cmd is active, request it to be stopped and sleep until it
cdbb70bb
CH		 1603 * has completed.
1604 */
cf572a96 1605bool target_stop_cmd(struct se_cmd *cmd, unsigned long *flags)
cb0df4d3
BVA		 1606 __releases(&cmd->t_state_lock)
1607 __acquires(&cmd->t_state_lock)
cdbb70bb 1608{
cdbb70bb
CH		 1609 bool was_active = false;
1610
cf572a96
CH		 1611 if (cmd->transport_state & CMD_T_BUSY) {
1612 cmd->transport_state |= CMD_T_REQUEST_STOP;
cdbb70bb
CH		 1613 spin_unlock_irqrestore(&cmd->t_state_lock, *flags);
1614
cf572a96
CH		 1615 pr_debug("cmd %p waiting to complete\n", cmd);
1616 wait_for_completion(&cmd->task_stop_comp);
1617 pr_debug("cmd %p stopped successfully\n", cmd);
cdbb70bb
CH		 1618
1619 spin_lock_irqsave(&cmd->t_state_lock, *flags);
cf572a96
CH		 1620 cmd->transport_state &= ~CMD_T_REQUEST_STOP;
1621 cmd->transport_state &= ~CMD_T_BUSY;
cdbb70bb
CH		 1622 was_active = true;
1623 }
1624
cdbb70bb
CH		 1625 return was_active;
1626}
1627
c66ac9db
NB		 1628/*
1629 * Handle SAM-esque emulation for generic transport request failures.
1630 */
de103c93
CH		 1631void transport_generic_request_failure(struct se_cmd *cmd,
1632 sense_reason_t sense_reason)
c66ac9db 1633{
07bde79a
NB		 1634 int ret = 0;
1635
6708bb27 1636 pr_debug("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x"
e3d6f909 1637 " CDB: 0x%02x\n", cmd, cmd->se_tfo->get_task_tag(cmd),
a1d8b49a 1638 cmd->t_task_cdb[0]);
de103c93 1639 pr_debug("-----[ i_state: %d t_state: %d sense_reason: %d\n",
e3d6f909 1640 cmd->se_tfo->get_cmd_state(cmd),
de103c93 1641 cmd->t_state, sense_reason);
d43d6aea 1642 pr_debug("-----[ CMD_T_ACTIVE: %d CMD_T_STOP: %d CMD_T_SENT: %d\n",
7d680f3b
CH		 1643 (cmd->transport_state & CMD_T_ACTIVE) != 0,
1644 (cmd->transport_state & CMD_T_STOP) != 0,
1645 (cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db 1646
c66ac9db
NB		 1647 /*
1648 * For SAM Task Attribute emulation for failed struct se_cmd
1649 */
019c4ca6 1650 transport_complete_task_attr(cmd);
cf6d1f09
NB		 1651 /*
1652 * Handle special case for COMPARE_AND_WRITE failure, where the
c8e63985 1653 * callback is expected to drop the per device ->caw_sem.
cf6d1f09
NB		 1654 */
1655 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
1656 cmd->transport_complete_callback)
c8e63985 1657 cmd->transport_complete_callback(cmd, false);
c66ac9db 1658
de103c93 1659 switch (sense_reason) {
03e98c9e
NB		 1660 case TCM_NON_EXISTENT_LUN:
1661 case TCM_UNSUPPORTED_SCSI_OPCODE:
1662 case TCM_INVALID_CDB_FIELD:
1663 case TCM_INVALID_PARAMETER_LIST:
bb992e72 1664 case TCM_PARAMETER_LIST_LENGTH_ERROR:
03e98c9e
NB		 1665 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
1666 case TCM_UNKNOWN_MODE_PAGE:
1667 case TCM_WRITE_PROTECTED:
e2397c70 1668 case TCM_ADDRESS_OUT_OF_RANGE:
03e98c9e
NB		 1669 case TCM_CHECK_CONDITION_ABORT_CMD:
1670 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
1671 case TCM_CHECK_CONDITION_NOT_READY:
94387aa7
NB		 1672 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
1673 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
1674 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
c66ac9db 1675 break;
de103c93
CH		 1676 case TCM_OUT_OF_RESOURCES:
1677 sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
1678 break;
03e98c9e 1679 case TCM_RESERVATION_CONFLICT:
c66ac9db
NB		 1680 /*
1681 * No SENSE Data payload for this case, set SCSI Status
1682 * and queue the response to $FABRIC_MOD.
1683 *
1684 * Uses linux/include/scsi/scsi.h SAM status codes defs
1685 */
1686 cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT;
1687 /*
1688 * For UA Interlock Code 11b, a RESERVATION CONFLICT will
1689 * establish a UNIT ATTENTION with PREVIOUS RESERVATION
1690 * CONFLICT STATUS.
1691 *
1692 * See spc4r17, section 7.4.6 Control Mode Page, Table 349
1693 */
e3d6f909 1694 if (cmd->se_sess &&
0fd97ccf 1695 cmd->se_dev->dev_attrib.emulate_ua_intlck_ctrl == 2)
e3d6f909 1696 core_scsi3_ua_allocate(cmd->se_sess->se_node_acl,
c66ac9db
NB		 1697 cmd->orig_fe_lun, 0x2C,
1698 ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS);
1699
e5c0d6ad
RD		 1700 trace_target_cmd_complete(cmd);
1701 ret = cmd->se_tfo-> queue_status(cmd);
f147abb4 1702 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 1703 goto queue_full;
c66ac9db 1704 goto check_stop;
c66ac9db 1705 default:
6708bb27 1706 pr_err("Unknown transport error for CDB 0x%02x: %d\n",
de103c93
CH		 1707 cmd->t_task_cdb[0], sense_reason);
1708 sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE;
c66ac9db
NB		 1709 break;
1710 }
f3146437 1711
de103c93 1712 ret = transport_send_check_condition_and_sense(cmd, sense_reason, 0);
03e98c9e
NB		 1713 if (ret == -EAGAIN || ret == -ENOMEM)
1714 goto queue_full;
07bde79a 1715
c66ac9db
NB		 1716check_stop:
1717 transport_lun_remove_cmd(cmd);
6708bb27 1718 if (!transport_cmd_check_stop_to_fabric(cmd))
c66ac9db 1719 ;
07bde79a
NB		 1720 return;
1721
1722queue_full:
e057f533
CH		 1723 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
1724 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db 1725}
2fbff127 1726EXPORT_SYMBOL(transport_generic_request_failure);
c66ac9db 1727
76dde50e 1728void __target_execute_cmd(struct se_cmd *cmd)
c66ac9db 1729{
de103c93 1730 sense_reason_t ret;
5f41a31d 1731
de103c93
CH		 1732 if (cmd->execute_cmd) {
1733 ret = cmd->execute_cmd(cmd);
1734 if (ret) {
1735 spin_lock_irq(&cmd->t_state_lock);
1736 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
1737 spin_unlock_irq(&cmd->t_state_lock);
5f41a31d 1738
de103c93
CH		 1739 transport_generic_request_failure(cmd, ret);
1740 }
5f41a31d
CH		 1741 }
1742}
1743
aa58b531
NB		 1744static int target_write_prot_action(struct se_cmd *cmd)
1745{
5132d1e6 1746 u32 sectors;
aa58b531
NB		 1747 /*
1748 * Perform WRITE_INSERT of PI using software emulation when backend
1749 * device has PI enabled, if the transport has not already generated
1750 * PI using hardware WRITE_INSERT offload.
1751 */
1752 switch (cmd->prot_op) {
1753 case TARGET_PROT_DOUT_INSERT:
1754 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_INSERT))
1755 sbc_dif_generate(cmd);
1756 break;
5132d1e6
NB		 1757 case TARGET_PROT_DOUT_STRIP:
1758 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DOUT_STRIP)
1759 break;
1760
1761 sectors = cmd->data_length >> ilog2(cmd->se_dev->dev_attrib.block_size);
1762 cmd->pi_err = sbc_dif_verify_write(cmd, cmd->t_task_lba,
1763 sectors, 0, NULL, 0);
1764 if (unlikely(cmd->pi_err)) {
1765 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1766 cmd->transport_state &= ~(CMD_T_BUSY|CMD_T_SENT);
5132d1e6
NB		 1767 spin_unlock_irq(&cmd->t_state_lock);
1768 transport_generic_request_failure(cmd, cmd->pi_err);
1769 return -1;
1770 }
1771 break;
aa58b531
NB		 1772 default:
1773 break;
1774 }
1775
1776 return 0;
1777}
1778
019c4ca6 1779static bool target_handle_task_attr(struct se_cmd *cmd)
5f41a31d
CH		 1780{
1781 struct se_device *dev = cmd->se_dev;
1782
a3541703 1783 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6 1784 return false;
5f41a31d 1785
c66ac9db 1786 /*
25985edc 1787 * Check for the existence of HEAD_OF_QUEUE, and if true return 1
c66ac9db
NB		 1788 * to allow the passed struct se_cmd list of tasks to the front of the list.
1789 */
5f41a31d 1790 switch (cmd->sam_task_attr) {
68d81f40 1791 case TCM_HEAD_TAG:
5f41a31d
CH		 1792 pr_debug("Added HEAD_OF_QUEUE for CDB: 0x%02x, "
1793 "se_ordered_id: %u\n",
1794 cmd->t_task_cdb[0], cmd->se_ordered_id);
019c4ca6 1795 return false;
68d81f40 1796 case TCM_ORDERED_TAG:
33940d09 1797 atomic_inc_mb(&dev->dev_ordered_sync);
c66ac9db 1798
5f41a31d
CH		 1799 pr_debug("Added ORDERED for CDB: 0x%02x to ordered list, "
1800 " se_ordered_id: %u\n",
1801 cmd->t_task_cdb[0], cmd->se_ordered_id);
1802
c66ac9db 1803 /*
5f41a31d
CH		 1804 * Execute an ORDERED command if no other older commands
1805 * exist that need to be completed first.
c66ac9db 1806 */
5f41a31d 1807 if (!atomic_read(&dev->simple_cmds))
019c4ca6 1808 return false;
5f41a31d
CH		 1809 break;
1810 default:
c66ac9db
NB		 1811 /*
1812 * For SIMPLE and UNTAGGED Task Attribute commands
1813 */
33940d09 1814 atomic_inc_mb(&dev->simple_cmds);
5f41a31d 1815 break;
c66ac9db 1816 }
5f41a31d 1817
019c4ca6
CH		 1818 if (atomic_read(&dev->dev_ordered_sync) == 0)
1819 return false;
c66ac9db 1820
019c4ca6
CH		 1821 spin_lock(&dev->delayed_cmd_lock);
1822 list_add_tail(&cmd->se_delayed_node, &dev->delayed_cmd_list);
1823 spin_unlock(&dev->delayed_cmd_lock);
1824
1825 pr_debug("Added CDB: 0x%02x Task Attr: 0x%02x to"
1826 " delayed CMD list, se_ordered_id: %u\n",
1827 cmd->t_task_cdb[0], cmd->sam_task_attr,
1828 cmd->se_ordered_id);
1829 return true;
1830}
1831
1832void target_execute_cmd(struct se_cmd *cmd)
1833{
1834 /*
1835 * If the received CDB has aleady been aborted stop processing it here.
1836 */
4a9a6c8d 1837 if (transport_check_aborted_status(cmd, 1))
5f41a31d 1838 return;
c66ac9db 1839
019c4ca6
CH		 1840 /*
1841 * Determine if frontend context caller is requesting the stopping of
1842 * this command for frontend exceptions.
1843 */
4a9a6c8d 1844 spin_lock_irq(&cmd->t_state_lock);
019c4ca6
CH		 1845 if (cmd->transport_state & CMD_T_STOP) {
1846 pr_debug("%s:%d CMD_T_STOP for ITT: 0x%08x\n",
1847 __func__, __LINE__,
1848 cmd->se_tfo->get_task_tag(cmd));
1849
1850 spin_unlock_irq(&cmd->t_state_lock);
a95d6511 1851 complete_all(&cmd->t_transport_stop_comp);
019c4ca6
CH		 1852 return;
1853 }
1854
1855 cmd->t_state = TRANSPORT_PROCESSING;
1a398b97 1856 cmd->transport_state |= CMD_T_ACTIVE|CMD_T_BUSY|CMD_T_SENT;
019c4ca6 1857 spin_unlock_irq(&cmd->t_state_lock);
aa58b531
NB		 1858
1859 if (target_write_prot_action(cmd))
1860 return;
019c4ca6 1861
1a398b97
NB		 1862 if (target_handle_task_attr(cmd)) {
1863 spin_lock_irq(&cmd->t_state_lock);
6c2faeaa 1864 cmd->transport_state &= ~(CMD_T_BUSY | CMD_T_SENT);
1a398b97
NB		 1865 spin_unlock_irq(&cmd->t_state_lock);
1866 return;
1867 }
1868
1869 __target_execute_cmd(cmd);
c66ac9db 1870}
70baf0ab 1871EXPORT_SYMBOL(target_execute_cmd);
c66ac9db 1872
5f41a31d
CH		 1873/*
1874 * Process all commands up to the last received ORDERED task attribute which
1875 * requires another blocking boundary
1876 */
1877static void target_restart_delayed_cmds(struct se_device *dev)
1878{
1879 for (;;) {
1880 struct se_cmd *cmd;
1881
1882 spin_lock(&dev->delayed_cmd_lock);
1883 if (list_empty(&dev->delayed_cmd_list)) {
1884 spin_unlock(&dev->delayed_cmd_lock);
1885 break;
1886 }
1887
1888 cmd = list_entry(dev->delayed_cmd_list.next,
1889 struct se_cmd, se_delayed_node);
1890 list_del(&cmd->se_delayed_node);
1891 spin_unlock(&dev->delayed_cmd_lock);
1892
1893 __target_execute_cmd(cmd);
1894
68d81f40 1895 if (cmd->sam_task_attr == TCM_ORDERED_TAG)
5f41a31d
CH		 1896 break;
1897 }
1898}
1899
c66ac9db 1900/*
35e0e757 1901 * Called from I/O completion to determine which dormant/delayed
c66ac9db
NB		 1902 * and ordered cmds need to have their tasks added to the execution queue.
1903 */
1904static void transport_complete_task_attr(struct se_cmd *cmd)
1905{
5951146d 1906 struct se_device *dev = cmd->se_dev;
c66ac9db 1907
a3541703 1908 if (dev->transport->transport_flags & TRANSPORT_FLAG_PASSTHROUGH)
019c4ca6
CH		 1909 return;
1910
68d81f40 1911 if (cmd->sam_task_attr == TCM_SIMPLE_TAG) {
33940d09 1912 atomic_dec_mb(&dev->simple_cmds);
c66ac9db 1913 dev->dev_cur_ordered_id++;
6708bb27 1914 pr_debug("Incremented dev->dev_cur_ordered_id: %u for"
c66ac9db
NB		 1915 " SIMPLE: %u\n", dev->dev_cur_ordered_id,
1916 cmd->se_ordered_id);
68d81f40 1917 } else if (cmd->sam_task_attr == TCM_HEAD_TAG) {
c66ac9db 1918 dev->dev_cur_ordered_id++;
6708bb27 1919 pr_debug("Incremented dev_cur_ordered_id: %u for"
c66ac9db
NB		 1920 " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id,
1921 cmd->se_ordered_id);
68d81f40 1922 } else if (cmd->sam_task_attr == TCM_ORDERED_TAG) {
33940d09 1923 atomic_dec_mb(&dev->dev_ordered_sync);
c66ac9db
NB		 1924
1925 dev->dev_cur_ordered_id++;
6708bb27 1926 pr_debug("Incremented dev_cur_ordered_id: %u for ORDERED:"
c66ac9db
NB		 1927 " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id);
1928 }
c66ac9db 1929
5f41a31d 1930 target_restart_delayed_cmds(dev);
c66ac9db
NB		 1931}
1932
e057f533 1933static void transport_complete_qf(struct se_cmd *cmd)
07bde79a
NB		 1934{
1935 int ret = 0;
1936
019c4ca6 1937 transport_complete_task_attr(cmd);
e057f533
CH		 1938
1939 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
e5c0d6ad 1940 trace_target_cmd_complete(cmd);
e057f533 1941 ret = cmd->se_tfo->queue_status(cmd);
082f58ac 1942 goto out;
e057f533 1943 }
07bde79a
NB		 1944
1945 switch (cmd->data_direction) {
1946 case DMA_FROM_DEVICE:
e5c0d6ad 1947 trace_target_cmd_complete(cmd);
07bde79a
NB		 1948 ret = cmd->se_tfo->queue_data_in(cmd);
1949 break;
1950 case DMA_TO_DEVICE:
64577407 1951 if (cmd->se_cmd_flags & SCF_BIDI) {
07bde79a 1952 ret = cmd->se_tfo->queue_data_in(cmd);
63509c60 1953 break;
07bde79a
NB		 1954 }
1955 /* Fall through for DMA_TO_DEVICE */
1956 case DMA_NONE:
e5c0d6ad 1957 trace_target_cmd_complete(cmd);
07bde79a
NB		 1958 ret = cmd->se_tfo->queue_status(cmd);
1959 break;
1960 default:
1961 break;
1962 }
1963
e057f533
CH		 1964out:
1965 if (ret < 0) {
1966 transport_handle_queue_full(cmd, cmd->se_dev);
1967 return;
1968 }
1969 transport_lun_remove_cmd(cmd);
1970 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 1971}
1972
1973static void transport_handle_queue_full(
1974 struct se_cmd *cmd,
e057f533 1975 struct se_device *dev)
07bde79a
NB		 1976{
1977 spin_lock_irq(&dev->qf_cmd_lock);
07bde79a 1978 list_add_tail(&cmd->se_qf_node, &cmd->se_dev->qf_cmd_list);
33940d09 1979 atomic_inc_mb(&dev->dev_qf_count);
07bde79a
NB		 1980 spin_unlock_irq(&cmd->se_dev->qf_cmd_lock);
1981
1982 schedule_work(&cmd->se_dev->qf_work_queue);
1983}
1984
fdeab852 1985static bool target_read_prot_action(struct se_cmd *cmd)
bc005869
NB		 1986{
1987 sense_reason_t rc;
1988
fdeab852
NB		 1989 switch (cmd->prot_op) {
1990 case TARGET_PROT_DIN_STRIP:
1991 if (!(cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_STRIP)) {
1992 rc = sbc_dif_read_strip(cmd);
1993 if (rc) {
1994 cmd->pi_err = rc;
1995 return true;
1996 }
bc005869 1997 }
fdeab852 1998 break;
72c03850
NB		 1999 case TARGET_PROT_DIN_INSERT:
2000 if (cmd->se_sess->sup_prot_ops & TARGET_PROT_DIN_INSERT)
2001 break;
2002
2003 sbc_dif_generate(cmd);
2004 break;
fdeab852
NB		 2005 default:
2006 break;
bc005869
NB		 2007 }
2008
2009 return false;
2010}
2011
35e0e757 2012static void target_complete_ok_work(struct work_struct *work)
c66ac9db 2013{
35e0e757 2014 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
27a27099 2015 int ret;
35e0e757 2016
c66ac9db
NB		 2017 /*
2018 * Check if we need to move delayed/dormant tasks from cmds on the
2019 * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task
2020 * Attribute.
2021 */
019c4ca6
CH		 2022 transport_complete_task_attr(cmd);
2023
07bde79a
NB		 2024 /*
2025 * Check to schedule QUEUE_FULL work, or execute an existing
2026 * cmd->transport_qf_callback()
2027 */
2028 if (atomic_read(&cmd->se_dev->dev_qf_count) != 0)
2029 schedule_work(&cmd->se_dev->qf_work_queue);
2030
c66ac9db 2031 /*
d5829eac 2032 * Check if we need to send a sense buffer from
c66ac9db
NB		 2033 * the struct se_cmd in question.
2034 */
2035 if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) {
27a27099 2036 WARN_ON(!cmd->scsi_status);
27a27099
PB		 2037 ret = transport_send_check_condition_and_sense(
2038 cmd, 0, 1);
2039 if (ret == -EAGAIN || ret == -ENOMEM)
2040 goto queue_full;
2041
2042 transport_lun_remove_cmd(cmd);
2043 transport_cmd_check_stop_to_fabric(cmd);
2044 return;
c66ac9db
NB		 2045 }
2046 /*
25985edc 2047 * Check for a callback, used by amongst other things
a6b0133c 2048 * XDWRITE_READ_10 and COMPARE_AND_WRITE emulation.
c66ac9db 2049 */
a6b0133c
NB		 2050 if (cmd->transport_complete_callback) {
2051 sense_reason_t rc;
2052
c8e63985 2053 rc = cmd->transport_complete_callback(cmd, true);
a2890087 2054 if (!rc && !(cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE_POST)) {
c8e63985
NB		 2055 if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2056 !cmd->data_length)
2057 goto queue_rsp;
2058
a6b0133c 2059 return;
a2890087
NB		 2060 } else if (rc) {
2061 ret = transport_send_check_condition_and_sense(cmd,
2062 rc, 0);
2063 if (ret == -EAGAIN || ret == -ENOMEM)
2064 goto queue_full;
a6b0133c 2065
a2890087
NB		 2066 transport_lun_remove_cmd(cmd);
2067 transport_cmd_check_stop_to_fabric(cmd);
2068 return;
2069 }
a6b0133c 2070 }
c66ac9db 2071
c8e63985 2072queue_rsp:
c66ac9db
NB		 2073 switch (cmd->data_direction) {
2074 case DMA_FROM_DEVICE:
2075 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2076 if (cmd->se_lun->lun_sep) {
2077 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2078 cmd->data_length;
2079 }
2080 spin_unlock(&cmd->se_lun->lun_sep_lock);
bc005869
NB		 2081 /*
2082 * Perform READ_STRIP of PI using software emulation when
2083 * backend had PI enabled, if the transport will not be
2084 * performing hardware READ_STRIP offload.
2085 */
fdeab852 2086 if (target_read_prot_action(cmd)) {
bc005869
NB		 2087 ret = transport_send_check_condition_and_sense(cmd,
2088 cmd->pi_err, 0);
2089 if (ret == -EAGAIN || ret == -ENOMEM)
2090 goto queue_full;
2091
2092 transport_lun_remove_cmd(cmd);
2093 transport_cmd_check_stop_to_fabric(cmd);
2094 return;
2095 }
c66ac9db 2096
e5c0d6ad 2097 trace_target_cmd_complete(cmd);
07bde79a 2098 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2099 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2100 goto queue_full;
c66ac9db
NB		 2101 break;
2102 case DMA_TO_DEVICE:
2103 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2104 if (cmd->se_lun->lun_sep) {
2105 cmd->se_lun->lun_sep->sep_stats.rx_data_octets +=
c66ac9db
NB		 2106 cmd->data_length;
2107 }
2108 spin_unlock(&cmd->se_lun->lun_sep_lock);
2109 /*
2110 * Check if we need to send READ payload for BIDI-COMMAND
2111 */
64577407 2112 if (cmd->se_cmd_flags & SCF_BIDI) {
c66ac9db 2113 spin_lock(&cmd->se_lun->lun_sep_lock);
e3d6f909
AG		 2114 if (cmd->se_lun->lun_sep) {
2115 cmd->se_lun->lun_sep->sep_stats.tx_data_octets +=
c66ac9db
NB		 2116 cmd->data_length;
2117 }
2118 spin_unlock(&cmd->se_lun->lun_sep_lock);
07bde79a 2119 ret = cmd->se_tfo->queue_data_in(cmd);
f147abb4 2120 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2121 goto queue_full;
c66ac9db
NB		 2122 break;
2123 }
2124 /* Fall through for DMA_TO_DEVICE */
2125 case DMA_NONE:
e5c0d6ad 2126 trace_target_cmd_complete(cmd);
07bde79a 2127 ret = cmd->se_tfo->queue_status(cmd);
f147abb4 2128 if (ret == -EAGAIN || ret == -ENOMEM)
07bde79a 2129 goto queue_full;
c66ac9db
NB		 2130 break;
2131 default:
2132 break;
2133 }
2134
2135 transport_lun_remove_cmd(cmd);
2136 transport_cmd_check_stop_to_fabric(cmd);
07bde79a
NB		 2137 return;
2138
2139queue_full:
6708bb27 2140 pr_debug("Handling complete_ok QUEUE_FULL: se_cmd: %p,"
07bde79a 2141 " data_direction: %d\n", cmd, cmd->data_direction);
e057f533
CH		 2142 cmd->t_state = TRANSPORT_COMPLETE_QF_OK;
2143 transport_handle_queue_full(cmd, cmd->se_dev);
c66ac9db
NB		 2144}
2145
6708bb27 2146static inline void transport_free_sgl(struct scatterlist *sgl, int nents)
c66ac9db 2147{
ec98f782 2148 struct scatterlist *sg;
ec98f782 2149 int count;
c66ac9db 2150
6708bb27
AG		 2151 for_each_sg(sgl, sg, nents, count)
2152 __free_page(sg_page(sg));
c66ac9db 2153
6708bb27
AG		 2154 kfree(sgl);
2155}
c66ac9db 2156
47e459e6
NB		 2157static inline void transport_reset_sgl_orig(struct se_cmd *cmd)
2158{
2159 /*
2160 * Check for saved t_data_sg that may be used for COMPARE_AND_WRITE
2161 * emulation, and free + reset pointers if necessary..
2162 */
2163 if (!cmd->t_data_sg_orig)
2164 return;
2165
2166 kfree(cmd->t_data_sg);
2167 cmd->t_data_sg = cmd->t_data_sg_orig;
2168 cmd->t_data_sg_orig = NULL;
2169 cmd->t_data_nents = cmd->t_data_nents_orig;
2170 cmd->t_data_nents_orig = 0;
2171}
2172
6708bb27
AG		 2173static inline void transport_free_pages(struct se_cmd *cmd)
2174{
47e459e6 2175 if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) {
c8e63985
NB		 2176 /*
2177 * Release special case READ buffer payload required for
2178 * SG_TO_MEM_NOALLOC to function with COMPARE_AND_WRITE
2179 */
2180 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) {
2181 transport_free_sgl(cmd->t_bidi_data_sg,
2182 cmd->t_bidi_data_nents);
2183 cmd->t_bidi_data_sg = NULL;
2184 cmd->t_bidi_data_nents = 0;
2185 }
47e459e6 2186 transport_reset_sgl_orig(cmd);
6708bb27 2187 return;
47e459e6
NB		 2188 }
2189 transport_reset_sgl_orig(cmd);
6708bb27
AG		 2190
2191 transport_free_sgl(cmd->t_data_sg, cmd->t_data_nents);
ec98f782
AG		 2192 cmd->t_data_sg = NULL;
2193 cmd->t_data_nents = 0;
c66ac9db 2194
6708bb27 2195 transport_free_sgl(cmd->t_bidi_data_sg, cmd->t_bidi_data_nents);
ec98f782
AG		 2196 cmd->t_bidi_data_sg = NULL;
2197 cmd->t_bidi_data_nents = 0;
acb2bde3
SG		 2198
2199 transport_free_sgl(cmd->t_prot_sg, cmd->t_prot_nents);
2200 cmd->t_prot_sg = NULL;
2201 cmd->t_prot_nents = 0;
c66ac9db
NB		 2202}
2203
e26d99ae
CH		 2204/**
2205 * transport_release_cmd - free a command
2206 * @cmd: command to free
2207 *
2208 * This routine unconditionally frees a command, and reference counting
2209 * or list removal must be done in the caller.
2210 */
d5ddad41 2211static int transport_release_cmd(struct se_cmd *cmd)
e26d99ae
CH		 2212{
2213 BUG_ON(!cmd->se_tfo);
2214
c8e31f26 2215 if (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
e26d99ae
CH		 2216 core_tmr_release_req(cmd->se_tmr_req);
2217 if (cmd->t_task_cdb != cmd->__t_task_cdb)
2218 kfree(cmd->t_task_cdb);
2219 /*
7481deb4
NB		 2220 * If this cmd has been setup with target_get_sess_cmd(), drop
2221 * the kref and call ->release_cmd() in kref callback.
e26d99ae 2222 */
ca24976a 2223 return target_put_sess_cmd(cmd->se_sess, cmd);
e26d99ae
CH		 2224}
2225
d3df7825
CH		 2226/**
2227 * transport_put_cmd - release a reference to a command
2228 * @cmd: command to release
2229 *
2230 * This routine releases our reference to the command and frees it if possible.
2231 */
d5ddad41 2232static int transport_put_cmd(struct se_cmd *cmd)
c66ac9db 2233{
c66ac9db 2234 transport_free_pages(cmd);
d5ddad41 2235 return transport_release_cmd(cmd);
c66ac9db 2236}
c66ac9db 2237
4949314c 2238void *transport_kmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2239{
ec98f782 2240 struct scatterlist *sg = cmd->t_data_sg;
4949314c
AG		 2241 struct page **pages;
2242 int i;
05d1c7c0
AG		 2243
2244 /*
ec98f782
AG		 2245 * We need to take into account a possible offset here for fabrics like
2246 * tcm_loop who may be using a contig buffer from the SCSI midlayer for
2247 * control CDBs passed as SGLs via transport_generic_map_mem_to_cmd()
05d1c7c0 2248 */
4949314c
AG		 2249 if (!cmd->t_data_nents)
2250 return NULL;
3717ef0c
PB		 2251
2252 BUG_ON(!sg);
2253 if (cmd->t_data_nents == 1)
4949314c
AG		 2254 return kmap(sg_page(sg)) + sg->offset;
2255
2256 /* >1 page. use vmap */
2257 pages = kmalloc(sizeof(*pages) * cmd->t_data_nents, GFP_KERNEL);
de103c93 2258 if (!pages)
4949314c
AG		 2259 return NULL;
2260
2261 /* convert sg[] to pages[] */
2262 for_each_sg(cmd->t_data_sg, sg, cmd->t_data_nents, i) {
2263 pages[i] = sg_page(sg);
2264 }
2265
2266 cmd->t_data_vmap = vmap(pages, cmd->t_data_nents, VM_MAP, PAGE_KERNEL);
2267 kfree(pages);
de103c93 2268 if (!cmd->t_data_vmap)
4949314c
AG		 2269 return NULL;
2270
2271 return cmd->t_data_vmap + cmd->t_data_sg[0].offset;
05d1c7c0 2272}
4949314c 2273EXPORT_SYMBOL(transport_kmap_data_sg);
05d1c7c0 2274
4949314c 2275void transport_kunmap_data_sg(struct se_cmd *cmd)
05d1c7c0 2276{
a1edf9cf 2277 if (!cmd->t_data_nents) {
4949314c 2278 return;
a1edf9cf 2279 } else if (cmd->t_data_nents == 1) {
4949314c 2280 kunmap(sg_page(cmd->t_data_sg));
a1edf9cf
AG		 2281 return;
2282 }
4949314c
AG		 2283
2284 vunmap(cmd->t_data_vmap);
2285 cmd->t_data_vmap = NULL;
05d1c7c0 2286}
4949314c 2287EXPORT_SYMBOL(transport_kunmap_data_sg);
05d1c7c0 2288
c5ff8d6b 2289int
20093994
NB		 2290target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents, u32 length,
2291 bool zero_page)
c66ac9db 2292{
20093994 2293 struct scatterlist *sg;
ec98f782 2294 struct page *page;
20093994
NB		 2295 gfp_t zero_flag = (zero_page) ? __GFP_ZERO : 0;
2296 unsigned int nent;
ec98f782 2297 int i = 0;
c66ac9db 2298
20093994
NB		 2299 nent = DIV_ROUND_UP(length, PAGE_SIZE);
2300 sg = kmalloc(sizeof(struct scatterlist) * nent, GFP_KERNEL);
2301 if (!sg)
ec98f782 2302 return -ENOMEM;
c66ac9db 2303
20093994 2304 sg_init_table(sg, nent);
9db9da33 2305
ec98f782
AG		 2306 while (length) {
2307 u32 page_len = min_t(u32, length, PAGE_SIZE);
9db9da33 2308 page = alloc_page(GFP_KERNEL | zero_flag);
ec98f782
AG		 2309 if (!page)
2310 goto out;
c66ac9db 2311
20093994 2312 sg_set_page(&sg[i], page, page_len, 0);
ec98f782
AG		 2313 length -= page_len;
2314 i++;
c66ac9db 2315 }
20093994
NB		 2316 *sgl = sg;
2317 *nents = nent;
c66ac9db 2318 return 0;
c66ac9db 2319
ec98f782 2320out:
d0e27c88 2321 while (i > 0) {
ec98f782 2322 i--;
20093994 2323 __free_page(sg_page(&sg[i]));
c66ac9db 2324 }
20093994 2325 kfree(sg);
ec98f782 2326 return -ENOMEM;
c66ac9db
NB		 2327}
2328
da0f7619 2329/*
b16a35b0
AG		 2330 * Allocate any required resources to execute the command. For writes we
2331 * might not have the payload yet, so notify the fabric via a call to
2332 * ->write_pending instead. Otherwise place it on the execution queue.
c66ac9db 2333 */
de103c93
CH		 2334sense_reason_t
2335transport_generic_new_cmd(struct se_cmd *cmd)
c66ac9db 2336{
c66ac9db 2337 int ret = 0;
c8e63985 2338 bool zero_flag = !(cmd->se_cmd_flags & SCF_SCSI_DATA_CDB);
c66ac9db
NB		 2339
2340 /*
2341 * Determine is the TCM fabric module has already allocated physical
2342 * memory, and is directly calling transport_generic_map_mem_to_cmd()
ec98f782 2343 * beforehand.
c66ac9db 2344 */
ec98f782
AG		 2345 if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) &&
2346 cmd->data_length) {
20093994 2347
8cefe07b
NB		 2348 if ((cmd->se_cmd_flags & SCF_BIDI) ||
2349 (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)) {
2350 u32 bidi_length;
2351
2352 if (cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE)
2353 bidi_length = cmd->t_task_nolb *
2354 cmd->se_dev->dev_attrib.block_size;
2355 else
2356 bidi_length = cmd->data_length;
2357
2358 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2359 &cmd->t_bidi_data_nents,
2360 bidi_length, zero_flag);
2361 if (ret < 0)
2362 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2363 }
2364
19f9361a 2365 if (cmd->prot_op != TARGET_PROT_NORMAL) {
acb2bde3
SG		 2366 ret = target_alloc_sgl(&cmd->t_prot_sg,
2367 &cmd->t_prot_nents,
2368 cmd->prot_length, true);
2369 if (ret < 0)
2370 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
2371 }
2372
20093994
NB		 2373 ret = target_alloc_sgl(&cmd->t_data_sg, &cmd->t_data_nents,
2374 cmd->data_length, zero_flag);
c66ac9db 2375 if (ret < 0)
de103c93 2376 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c8e63985
NB		 2377 } else if ((cmd->se_cmd_flags & SCF_COMPARE_AND_WRITE) &&
2378 cmd->data_length) {
2379 /*
2380 * Special case for COMPARE_AND_WRITE with fabrics
2381 * using SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC.
2382 */
2383 u32 caw_length = cmd->t_task_nolb *
2384 cmd->se_dev->dev_attrib.block_size;
2385
2386 ret = target_alloc_sgl(&cmd->t_bidi_data_sg,
2387 &cmd->t_bidi_data_nents,
2388 caw_length, zero_flag);
2389 if (ret < 0)
2390 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
c66ac9db 2391 }
c66ac9db 2392 /*
c3196f0c
CH		 2393 * If this command is not a write we can execute it right here,
2394 * for write buffers we need to notify the fabric driver first
2395 * and let it call back once the write buffers are ready.
c66ac9db 2396 */
5f41a31d 2397 target_add_to_state_list(cmd);
885e7b0e 2398 if (cmd->data_direction != DMA_TO_DEVICE || cmd->data_length == 0) {
c3196f0c
CH		 2399 target_execute_cmd(cmd);
2400 return 0;
2401 }
862e6389 2402 transport_cmd_check_stop(cmd, false, true);
c3196f0c
CH		 2403
2404 ret = cmd->se_tfo->write_pending(cmd);
2405 if (ret == -EAGAIN || ret == -ENOMEM)
2406 goto queue_full;
2407
de103c93
CH		 2408 /* fabric drivers should only return -EAGAIN or -ENOMEM as error */
2409 WARN_ON(ret);
2410
b69c1fcf 2411 return (!ret) ? 0 : TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
da0f7619 2412
c3196f0c
CH		 2413queue_full:
2414 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n", cmd);
2415 cmd->t_state = TRANSPORT_COMPLETE_QF_WP;
2416 transport_handle_queue_full(cmd, cmd->se_dev);
2417 return 0;
c66ac9db 2418}
a1d8b49a 2419EXPORT_SYMBOL(transport_generic_new_cmd);
c66ac9db 2420
e057f533 2421static void transport_write_pending_qf(struct se_cmd *cmd)
07bde79a 2422{
f147abb4
NB		 2423 int ret;
2424
2425 ret = cmd->se_tfo->write_pending(cmd);
2426 if (ret == -EAGAIN || ret == -ENOMEM) {
e057f533
CH		 2427 pr_debug("Handling write_pending QUEUE__FULL: se_cmd: %p\n",
2428 cmd);
2429 transport_handle_queue_full(cmd, cmd->se_dev);
2430 }
07bde79a
NB		 2431}
2432
d5ddad41 2433int transport_generic_free_cmd(struct se_cmd *cmd, int wait_for_tasks)
c66ac9db 2434{
c130480b 2435 unsigned long flags;
d5ddad41
NB		 2436 int ret = 0;
2437
d14921d6 2438 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD)) {
c8e31f26 2439 if (wait_for_tasks && (cmd->se_cmd_flags & SCF_SCSI_TMR_CDB))
d14921d6
NB		 2440 transport_wait_for_tasks(cmd);
2441
d5ddad41 2442 ret = transport_release_cmd(cmd);
d14921d6
NB		 2443 } else {
2444 if (wait_for_tasks)
2445 transport_wait_for_tasks(cmd);
c130480b
NB		 2446 /*
2447 * Handle WRITE failure case where transport_generic_new_cmd()
2448 * has already added se_cmd to state_list, but fabric has
2449 * failed command before I/O submission.
2450 */
2451 if (cmd->state_active) {
2452 spin_lock_irqsave(&cmd->t_state_lock, flags);
2453 target_remove_from_state_list(cmd);
2454 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2455 }
d14921d6 2456
82f1c8a4 2457 if (cmd->se_lun)
c66ac9db 2458 transport_lun_remove_cmd(cmd);
c66ac9db 2459
d5ddad41 2460 ret = transport_put_cmd(cmd);
c66ac9db 2461 }
d5ddad41 2462 return ret;
c66ac9db
NB		 2463}
2464EXPORT_SYMBOL(transport_generic_free_cmd);
2465
a17f091d
NB		 2466/* target_get_sess_cmd - Add command to active ->sess_cmd_list
2467 * @se_sess: session to reference
2468 * @se_cmd: command descriptor to add
a6360785 2469 * @ack_kref: Signal that fabric will perform an ack target_put_sess_cmd()
a17f091d 2470 */
20361e69 2471int target_get_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd,
bc187ea6 2472 bool ack_kref)
a17f091d
NB		 2473{
2474 unsigned long flags;
bc187ea6 2475 int ret = 0;
a17f091d 2476
a6360785
NB		 2477 /*
2478 * Add a second kref if the fabric caller is expecting to handle
2479 * fabric acknowledgement that requires two target_put_sess_cmd()
2480 * invocations before se_cmd descriptor release.
2481 */
054922bb 2482 if (ack_kref)
a6360785 2483 kref_get(&se_cmd->cmd_kref);
7481deb4 2484
a17f091d 2485 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
bc187ea6
RD		 2486 if (se_sess->sess_tearing_down) {
2487 ret = -ESHUTDOWN;
2488 goto out;
2489 }
a17f091d 2490 list_add_tail(&se_cmd->se_cmd_list, &se_sess->sess_cmd_list);
bc187ea6 2491out:
a17f091d 2492 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
7544e597
BVA		 2493
2494 if (ret && ack_kref)
2495 target_put_sess_cmd(se_sess, se_cmd);
2496
bc187ea6 2497 return ret;
a17f091d 2498}
20361e69 2499EXPORT_SYMBOL(target_get_sess_cmd);
a17f091d 2500
7481deb4 2501static void target_release_cmd_kref(struct kref *kref)
077aa3b2 2502 __releases(&se_cmd->se_sess->sess_cmd_lock)
a17f091d 2503{
7481deb4
NB		 2504 struct se_cmd *se_cmd = container_of(kref, struct se_cmd, cmd_kref);
2505 struct se_session *se_sess = se_cmd->se_sess;
a17f091d 2506
a17f091d 2507 if (list_empty(&se_cmd->se_cmd_list)) {
ccf5ae83 2508 spin_unlock(&se_sess->sess_cmd_lock);
ffc32d52 2509 se_cmd->se_tfo->release_cmd(se_cmd);
7481deb4 2510 return;
a17f091d 2511 }
a17f091d 2512 if (se_sess->sess_tearing_down && se_cmd->cmd_wait_set) {
ccf5ae83 2513 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2514 complete(&se_cmd->cmd_wait_comp);
7481deb4 2515 return;
a17f091d
NB		 2516 }
2517 list_del(&se_cmd->se_cmd_list);
ccf5ae83 2518 spin_unlock(&se_sess->sess_cmd_lock);
a17f091d 2519
7481deb4
NB		 2520 se_cmd->se_tfo->release_cmd(se_cmd);
2521}
2522
2523/* target_put_sess_cmd - Check for active I/O shutdown via kref_put
2524 * @se_sess: session to reference
2525 * @se_cmd: command descriptor to drop
2526 */
2527int target_put_sess_cmd(struct se_session *se_sess, struct se_cmd *se_cmd)
2528{
0ed6e189
NB		 2529 if (!se_sess) {
2530 se_cmd->se_tfo->release_cmd(se_cmd);
2531 return 1;
2532 }
ccf5ae83
JE		 2533 return kref_put_spinlock_irqsave(&se_cmd->cmd_kref, target_release_cmd_kref,
2534 &se_sess->sess_cmd_lock);
a17f091d
NB		 2535}
2536EXPORT_SYMBOL(target_put_sess_cmd);
2537
1c7b13fe
RD		 2538/* target_sess_cmd_list_set_waiting - Flag all commands in
2539 * sess_cmd_list to complete cmd_wait_comp. Set
2540 * sess_tearing_down so no more commands are queued.
2541 * @se_sess: session to flag
a17f091d 2542 */
1c7b13fe 2543void target_sess_cmd_list_set_waiting(struct se_session *se_sess)
a17f091d
NB		 2544{
2545 struct se_cmd *se_cmd;
2546 unsigned long flags;
2547
a17f091d 2548 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
9b31a328
NB		 2549 if (se_sess->sess_tearing_down) {
2550 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2551 return;
2552 }
1c7b13fe 2553 se_sess->sess_tearing_down = 1;
9b31a328 2554 list_splice_init(&se_sess->sess_cmd_list, &se_sess->sess_wait_list);
a17f091d 2555
9b31a328 2556 list_for_each_entry(se_cmd, &se_sess->sess_wait_list, se_cmd_list)
a17f091d
NB		 2557 se_cmd->cmd_wait_set = 1;
2558
2559 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2560}
1c7b13fe 2561EXPORT_SYMBOL(target_sess_cmd_list_set_waiting);
a17f091d
NB		 2562
2563/* target_wait_for_sess_cmds - Wait for outstanding descriptors
2564 * @se_sess: session to wait for active I/O
a17f091d 2565 */
be646c2d 2566void target_wait_for_sess_cmds(struct se_session *se_sess)
a17f091d
NB		 2567{
2568 struct se_cmd *se_cmd, *tmp_cmd;
9b31a328 2569 unsigned long flags;
a17f091d
NB		 2570
2571 list_for_each_entry_safe(se_cmd, tmp_cmd,
9b31a328 2572 &se_sess->sess_wait_list, se_cmd_list) {
a17f091d
NB		 2573 list_del(&se_cmd->se_cmd_list);
2574
2575 pr_debug("Waiting for se_cmd: %p t_state: %d, fabric state:"
2576 " %d\n", se_cmd, se_cmd->t_state,
2577 se_cmd->se_tfo->get_cmd_state(se_cmd));
2578
be646c2d
JE		 2579 wait_for_completion(&se_cmd->cmd_wait_comp);
2580 pr_debug("After cmd_wait_comp: se_cmd: %p t_state: %d"
2581 " fabric state: %d\n", se_cmd, se_cmd->t_state,
2582 se_cmd->se_tfo->get_cmd_state(se_cmd));
a17f091d
NB		 2583
2584 se_cmd->se_tfo->release_cmd(se_cmd);
2585 }
9b31a328
NB		 2586
2587 spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
2588 WARN_ON(!list_empty(&se_sess->sess_cmd_list));
2589 spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
2590
a17f091d
NB		 2591}
2592EXPORT_SYMBOL(target_wait_for_sess_cmds);
2593
5277797d 2594static int transport_clear_lun_ref_thread(void *p)
c66ac9db 2595{
8359cf43 2596 struct se_lun *lun = p;
c66ac9db 2597
5277797d
NB		 2598 percpu_ref_kill(&lun->lun_ref);
2599
2600 wait_for_completion(&lun->lun_ref_comp);
c66ac9db
NB		 2601 complete(&lun->lun_shutdown_comp);
2602
2603 return 0;
2604}
2605
5277797d 2606int transport_clear_lun_ref(struct se_lun *lun)
c66ac9db
NB		 2607{
2608 struct task_struct *kt;
2609
5277797d 2610 kt = kthread_run(transport_clear_lun_ref_thread, lun,
c66ac9db
NB		 2611 "tcm_cl_%u", lun->unpacked_lun);
2612 if (IS_ERR(kt)) {
6708bb27 2613 pr_err("Unable to start clear_lun thread\n");
e3d6f909 2614 return PTR_ERR(kt);
c66ac9db
NB		 2615 }
2616 wait_for_completion(&lun->lun_shutdown_comp);
2617
2618 return 0;
2619}
2620
d14921d6
NB		 2621/**
2622 * transport_wait_for_tasks - wait for completion to occur
2623 * @cmd: command to wait
c66ac9db 2624 *
d14921d6
NB		 2625 * Called from frontend fabric context to wait for storage engine
2626 * to pause and/or release frontend generated struct se_cmd.
c66ac9db 2627 */
a17f091d 2628bool transport_wait_for_tasks(struct se_cmd *cmd)
c66ac9db
NB		 2629{
2630 unsigned long flags;
2631
a1d8b49a 2632 spin_lock_irqsave(&cmd->t_state_lock, flags);
c8e31f26
AG		 2633 if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) &&
2634 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2635 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2636 return false;
d14921d6 2637 }
cb4f4d3c 2638
c8e31f26
AG		 2639 if (!(cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) &&
2640 !(cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)) {
d14921d6 2641 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2642 return false;
d14921d6 2643 }
7d680f3b 2644
3d28934a 2645 if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d14921d6 2646 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d 2647 return false;
d14921d6 2648 }
c66ac9db 2649
7d680f3b 2650 cmd->transport_state |= CMD_T_STOP;
c66ac9db 2651
6708bb27 2652 pr_debug("wait_for_tasks: Stopping %p ITT: 0x%08x"
7d680f3b 2653 " i_state: %d, t_state: %d, CMD_T_STOP\n",
f2da9dbd
CH		 2654 cmd, cmd->se_tfo->get_task_tag(cmd),
2655 cmd->se_tfo->get_cmd_state(cmd), cmd->t_state);
c66ac9db 2656
a1d8b49a 2657 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db 2658
a1d8b49a 2659 wait_for_completion(&cmd->t_transport_stop_comp);
c66ac9db 2660
a1d8b49a 2661 spin_lock_irqsave(&cmd->t_state_lock, flags);
7d680f3b 2662 cmd->transport_state &= ~(CMD_T_ACTIVE | CMD_T_STOP);
c66ac9db 2663
35d1efe8 2664 pr_debug("wait_for_tasks: Stopped wait_for_completion("
a1d8b49a 2665 "&cmd->t_transport_stop_comp) for ITT: 0x%08x\n",
e3d6f909 2666 cmd->se_tfo->get_task_tag(cmd));
c66ac9db 2667
d14921d6 2668 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
a17f091d
NB		 2669
2670 return true;
c66ac9db 2671}
d14921d6 2672EXPORT_SYMBOL(transport_wait_for_tasks);
c66ac9db
NB		 2673
2674static int transport_get_sense_codes(
2675 struct se_cmd *cmd,
2676 u8 *asc,
2677 u8 *ascq)
2678{
2679 *asc = cmd->scsi_asc;
2680 *ascq = cmd->scsi_ascq;
2681
2682 return 0;
2683}
2684
76736db3
SG		 2685static
2686void transport_err_sector_info(unsigned char *buffer, sector_t bad_sector)
2687{
2688 /* Place failed LBA in sense data information descriptor 0. */
2689 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 0xc;
2690 buffer[SPC_DESC_TYPE_OFFSET] = 0; /* Information */
2691 buffer[SPC_ADDITIONAL_DESC_LEN_OFFSET] = 0xa;
2692 buffer[SPC_VALIDITY_OFFSET] = 0x80;
2693
2694 /* Descriptor Information: failing sector */
2695 put_unaligned_be64(bad_sector, &buffer[12]);
2696}
2697
de103c93
CH		 2698int
2699transport_send_check_condition_and_sense(struct se_cmd *cmd,
2700 sense_reason_t reason, int from_transport)
c66ac9db
NB		 2701{
2702 unsigned char *buffer = cmd->sense_buffer;
2703 unsigned long flags;
c66ac9db
NB		 2704 u8 asc = 0, ascq = 0;
2705
a1d8b49a 2706 spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db 2707 if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) {
a1d8b49a 2708 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2709 return 0;
2710 }
2711 cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION;
a1d8b49a 2712 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db
NB		 2713
2714 if (!reason && from_transport)
2715 goto after_reason;
2716
2717 if (!from_transport)
2718 cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE;
9c58b7dd 2719
c66ac9db
NB		 2720 /*
2721 * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses
2722 * SENSE KEY values from include/scsi/scsi.h
2723 */
2724 switch (reason) {
ba829137
HR		 2725 case TCM_NO_SENSE:
2726 /* CURRENT ERROR */
2727 buffer[0] = 0x70;
2728 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2729 /* Not Ready */
2730 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
2731 /* NO ADDITIONAL SENSE INFORMATION */
2732 buffer[SPC_ASC_KEY_OFFSET] = 0;
2733 buffer[SPC_ASCQ_KEY_OFFSET] = 0;
2734 break;
c66ac9db 2735 case TCM_NON_EXISTENT_LUN:
eb39d340 2736 /* CURRENT ERROR */
9c58b7dd
RD		 2737 buffer[0] = 0x70;
2738 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
eb39d340 2739 /* ILLEGAL REQUEST */
9c58b7dd 2740 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
eb39d340 2741 /* LOGICAL UNIT NOT SUPPORTED */
9c58b7dd 2742 buffer[SPC_ASC_KEY_OFFSET] = 0x25;
eb39d340 2743 break;
c66ac9db
NB		 2744 case TCM_UNSUPPORTED_SCSI_OPCODE:
2745 case TCM_SECTOR_COUNT_TOO_MANY:
2746 /* CURRENT ERROR */
9c58b7dd
RD		 2747 buffer[0] = 0x70;
2748 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2749 /* ILLEGAL REQUEST */
9c58b7dd 2750 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2751 /* INVALID COMMAND OPERATION CODE */
9c58b7dd 2752 buffer[SPC_ASC_KEY_OFFSET] = 0x20;
c66ac9db
NB		 2753 break;
2754 case TCM_UNKNOWN_MODE_PAGE:
2755 /* CURRENT ERROR */
9c58b7dd
RD		 2756 buffer[0] = 0x70;
2757 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2758 /* ILLEGAL REQUEST */
9c58b7dd 2759 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2760 /* INVALID FIELD IN CDB */
9c58b7dd 2761 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2762 break;
2763 case TCM_CHECK_CONDITION_ABORT_CMD:
2764 /* CURRENT ERROR */
9c58b7dd
RD		 2765 buffer[0] = 0x70;
2766 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2767 /* ABORTED COMMAND */
9c58b7dd 2768 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2769 /* BUS DEVICE RESET FUNCTION OCCURRED */
9c58b7dd
RD		 2770 buffer[SPC_ASC_KEY_OFFSET] = 0x29;
2771 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
c66ac9db
NB		 2772 break;
2773 case TCM_INCORRECT_AMOUNT_OF_DATA:
2774 /* CURRENT ERROR */
9c58b7dd
RD		 2775 buffer[0] = 0x70;
2776 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2777 /* ABORTED COMMAND */
9c58b7dd 2778 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2779 /* WRITE ERROR */
9c58b7dd 2780 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2781 /* NOT ENOUGH UNSOLICITED DATA */
9c58b7dd 2782 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0d;
c66ac9db
NB		 2783 break;
2784 case TCM_INVALID_CDB_FIELD:
2785 /* CURRENT ERROR */
9c58b7dd
RD		 2786 buffer[0] = 0x70;
2787 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2788 /* ILLEGAL REQUEST */
9c58b7dd 2789 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2790 /* INVALID FIELD IN CDB */
9c58b7dd 2791 buffer[SPC_ASC_KEY_OFFSET] = 0x24;
c66ac9db
NB		 2792 break;
2793 case TCM_INVALID_PARAMETER_LIST:
2794 /* CURRENT ERROR */
9c58b7dd
RD		 2795 buffer[0] = 0x70;
2796 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
9fbc8909 2797 /* ILLEGAL REQUEST */
9c58b7dd 2798 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
c66ac9db 2799 /* INVALID FIELD IN PARAMETER LIST */
9c58b7dd 2800 buffer[SPC_ASC_KEY_OFFSET] = 0x26;
c66ac9db 2801 break;
bb992e72
RD		 2802 case TCM_PARAMETER_LIST_LENGTH_ERROR:
2803 /* CURRENT ERROR */
2804 buffer[0] = 0x70;
2805 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2806 /* ILLEGAL REQUEST */
2807 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2808 /* PARAMETER LIST LENGTH ERROR */
2809 buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
2810 break;
c66ac9db
NB		 2811 case TCM_UNEXPECTED_UNSOLICITED_DATA:
2812 /* CURRENT ERROR */
9c58b7dd
RD		 2813 buffer[0] = 0x70;
2814 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2815 /* ABORTED COMMAND */
9c58b7dd 2816 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2817 /* WRITE ERROR */
9c58b7dd 2818 buffer[SPC_ASC_KEY_OFFSET] = 0x0c;
c66ac9db 2819 /* UNEXPECTED_UNSOLICITED_DATA */
9c58b7dd 2820 buffer[SPC_ASCQ_KEY_OFFSET] = 0x0c;
c66ac9db
NB		 2821 break;
2822 case TCM_SERVICE_CRC_ERROR:
2823 /* CURRENT ERROR */
9c58b7dd
RD		 2824 buffer[0] = 0x70;
2825 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2826 /* ABORTED COMMAND */
9c58b7dd 2827 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2828 /* PROTOCOL SERVICE CRC ERROR */
9c58b7dd 2829 buffer[SPC_ASC_KEY_OFFSET] = 0x47;
c66ac9db 2830 /* N/A */
9c58b7dd 2831 buffer[SPC_ASCQ_KEY_OFFSET] = 0x05;
c66ac9db
NB		 2832 break;
2833 case TCM_SNACK_REJECTED:
2834 /* CURRENT ERROR */
9c58b7dd
RD		 2835 buffer[0] = 0x70;
2836 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2837 /* ABORTED COMMAND */
9c58b7dd 2838 buffer[SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND;
c66ac9db 2839 /* READ ERROR */
9c58b7dd 2840 buffer[SPC_ASC_KEY_OFFSET] = 0x11;
c66ac9db 2841 /* FAILED RETRANSMISSION REQUEST */
9c58b7dd 2842 buffer[SPC_ASCQ_KEY_OFFSET] = 0x13;
c66ac9db
NB		 2843 break;
2844 case TCM_WRITE_PROTECTED:
2845 /* CURRENT ERROR */
9c58b7dd
RD		 2846 buffer[0] = 0x70;
2847 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2848 /* DATA PROTECT */
9c58b7dd 2849 buffer[SPC_SENSE_KEY_OFFSET] = DATA_PROTECT;
c66ac9db 2850 /* WRITE PROTECTED */
9c58b7dd 2851 buffer[SPC_ASC_KEY_OFFSET] = 0x27;
c66ac9db 2852 break;
e2397c70
RD		 2853 case TCM_ADDRESS_OUT_OF_RANGE:
2854 /* CURRENT ERROR */
9c58b7dd
RD		 2855 buffer[0] = 0x70;
2856 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
e2397c70 2857 /* ILLEGAL REQUEST */
9c58b7dd 2858 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
e2397c70 2859 /* LOGICAL BLOCK ADDRESS OUT OF RANGE */
9c58b7dd 2860 buffer[SPC_ASC_KEY_OFFSET] = 0x21;
e2397c70 2861 break;
c66ac9db
NB		 2862 case TCM_CHECK_CONDITION_UNIT_ATTENTION:
2863 /* CURRENT ERROR */
9c58b7dd
RD		 2864 buffer[0] = 0x70;
2865 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2866 /* UNIT ATTENTION */
9c58b7dd 2867 buffer[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
c66ac9db 2868 core_scsi3_ua_for_check_condition(cmd, &asc, &ascq);
9c58b7dd
RD		 2869 buffer[SPC_ASC_KEY_OFFSET] = asc;
2870 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db
NB		 2871 break;
2872 case TCM_CHECK_CONDITION_NOT_READY:
2873 /* CURRENT ERROR */
9c58b7dd
RD		 2874 buffer[0] = 0x70;
2875 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
c66ac9db 2876 /* Not Ready */
9c58b7dd 2877 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2878 transport_get_sense_codes(cmd, &asc, &ascq);
9c58b7dd
RD		 2879 buffer[SPC_ASC_KEY_OFFSET] = asc;
2880 buffer[SPC_ASCQ_KEY_OFFSET] = ascq;
c66ac9db 2881 break;
818b571c
NB		 2882 case TCM_MISCOMPARE_VERIFY:
2883 /* CURRENT ERROR */
2884 buffer[0] = 0x70;
2885 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2886 buffer[SPC_SENSE_KEY_OFFSET] = MISCOMPARE;
2887 /* MISCOMPARE DURING VERIFY OPERATION */
2888 buffer[SPC_ASC_KEY_OFFSET] = 0x1d;
2889 buffer[SPC_ASCQ_KEY_OFFSET] = 0x00;
2890 break;
fcc4f17b
NB		 2891 case TCM_LOGICAL_BLOCK_GUARD_CHECK_FAILED:
2892 /* CURRENT ERROR */
2893 buffer[0] = 0x70;
2894 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2895 /* ILLEGAL REQUEST */
2896 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2897 /* LOGICAL BLOCK GUARD CHECK FAILED */
2898 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2899 buffer[SPC_ASCQ_KEY_OFFSET] = 0x01;
76736db3 2900 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2901 break;
2902 case TCM_LOGICAL_BLOCK_APP_TAG_CHECK_FAILED:
2903 /* CURRENT ERROR */
2904 buffer[0] = 0x70;
2905 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2906 /* ILLEGAL REQUEST */
2907 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2908 /* LOGICAL BLOCK APPLICATION TAG CHECK FAILED */
2909 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2910 buffer[SPC_ASCQ_KEY_OFFSET] = 0x02;
76736db3 2911 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b
NB		 2912 break;
2913 case TCM_LOGICAL_BLOCK_REF_TAG_CHECK_FAILED:
2914 /* CURRENT ERROR */
2915 buffer[0] = 0x70;
2916 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
2917 /* ILLEGAL REQUEST */
2918 buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
2919 /* LOGICAL BLOCK REFERENCE TAG CHECK FAILED */
2920 buffer[SPC_ASC_KEY_OFFSET] = 0x10;
2921 buffer[SPC_ASCQ_KEY_OFFSET] = 0x03;
76736db3 2922 transport_err_sector_info(buffer, cmd->bad_sector);
fcc4f17b 2923 break;
c66ac9db
NB		 2924 case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
2925 default:
2926 /* CURRENT ERROR */
9c58b7dd
RD		 2927 buffer[0] = 0x70;
2928 buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
ad673282
JE		 2929 /*
2930 * Returning ILLEGAL REQUEST would cause immediate IO errors on
2931 * Solaris initiators. Returning NOT READY instead means the
2932 * operations will be retried a finite number of times and we
2933 * can survive intermittent errors.
2934 */
2935 buffer[SPC_SENSE_KEY_OFFSET] = NOT_READY;
c66ac9db 2936 /* LOGICAL UNIT COMMUNICATION FAILURE */
18a9df42 2937 buffer[SPC_ASC_KEY_OFFSET] = 0x08;
c66ac9db
NB		 2938 break;
2939 }
2940 /*
2941 * This code uses linux/include/scsi/scsi.h SAM status codes!
2942 */
2943 cmd->scsi_status = SAM_STAT_CHECK_CONDITION;
2944 /*
2945 * Automatically padded, this value is encoded in the fabric's
2946 * data_length response PDU containing the SCSI defined sense data.
2947 */
9c58b7dd 2948 cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER;
c66ac9db
NB		 2949
2950after_reason:
e5c0d6ad 2951 trace_target_cmd_complete(cmd);
07bde79a 2952 return cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 2953}
2954EXPORT_SYMBOL(transport_send_check_condition_and_sense);
2955
2956int transport_check_aborted_status(struct se_cmd *cmd, int send_status)
2957{
c18bc7d8
RD		 2958 if (!(cmd->transport_state & CMD_T_ABORTED))
2959 return 0;
c66ac9db 2960
68259b5a
AL		 2961 /*
2962 * If cmd has been aborted but either no status is to be sent or it has
2963 * already been sent, just return
2964 */
2965 if (!send_status || !(cmd->se_cmd_flags & SCF_SEND_DELAYED_TAS))
c18bc7d8 2966 return 1;
8b1e1244 2967
c18bc7d8
RD		 2968 pr_debug("Sending delayed SAM_STAT_TASK_ABORTED status for CDB: 0x%02x ITT: 0x%08x\n",
2969 cmd->t_task_cdb[0], cmd->se_tfo->get_task_tag(cmd));
8b1e1244 2970
68259b5a 2971 cmd->se_cmd_flags &= ~SCF_SEND_DELAYED_TAS;
29f4c090 2972 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
e5c0d6ad 2973 trace_target_cmd_complete(cmd);
c18bc7d8
RD		 2974 cmd->se_tfo->queue_status(cmd);
2975
2976 return 1;
c66ac9db
NB		 2977}
2978EXPORT_SYMBOL(transport_check_aborted_status);
2979
2980void transport_send_task_abort(struct se_cmd *cmd)
2981{
c252f003
NB		 2982 unsigned long flags;
2983
2984 spin_lock_irqsave(&cmd->t_state_lock, flags);
68259b5a 2985 if (cmd->se_cmd_flags & (SCF_SENT_CHECK_CONDITION)) {
c252f003
NB		 2986 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2987 return;
2988 }
2989 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
2990
c66ac9db
NB		 2991 /*
2992 * If there are still expected incoming fabric WRITEs, we wait
2993 * until until they have completed before sending a TASK_ABORTED
2994 * response. This response with TASK_ABORTED status will be
2995 * queued back to fabric module by transport_check_aborted_status().
2996 */
2997 if (cmd->data_direction == DMA_TO_DEVICE) {
e3d6f909 2998 if (cmd->se_tfo->write_pending_status(cmd) != 0) {
7d680f3b 2999 cmd->transport_state |= CMD_T_ABORTED;
68259b5a 3000 cmd->se_cmd_flags |= SCF_SEND_DELAYED_TAS;
29f4c090 3001 return;
c66ac9db
NB		 3002 }
3003 }
3004 cmd->scsi_status = SAM_STAT_TASK_ABORTED;
8b1e1244 3005
72b59d6e
RD		 3006 transport_lun_remove_cmd(cmd);
3007
6708bb27 3008 pr_debug("Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x,"
a1d8b49a 3009 " ITT: 0x%08x\n", cmd->t_task_cdb[0],
e3d6f909 3010 cmd->se_tfo->get_task_tag(cmd));
8b1e1244 3011
e5c0d6ad 3012 trace_target_cmd_complete(cmd);
e3d6f909 3013 cmd->se_tfo->queue_status(cmd);
c66ac9db
NB		 3014}
3015
af877292 3016static void target_tmr_work(struct work_struct *work)
c66ac9db 3017{
af877292 3018 struct se_cmd *cmd = container_of(work, struct se_cmd, work);
5951146d 3019 struct se_device *dev = cmd->se_dev;
c66ac9db
NB		 3020 struct se_tmr_req *tmr = cmd->se_tmr_req;
3021 int ret;
3022
3023 switch (tmr->function) {
5c6cd613 3024 case TMR_ABORT_TASK:
3d28934a 3025 core_tmr_abort_task(dev, tmr, cmd->se_sess);
c66ac9db 3026 break;
5c6cd613
NB		 3027 case TMR_ABORT_TASK_SET:
3028 case TMR_CLEAR_ACA:
3029 case TMR_CLEAR_TASK_SET:
c66ac9db
NB		 3030 tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED;
3031 break;
5c6cd613 3032 case TMR_LUN_RESET:
c66ac9db
NB		 3033 ret = core_tmr_lun_reset(dev, tmr, NULL, NULL);
3034 tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE :
3035 TMR_FUNCTION_REJECTED;
3036 break;
5c6cd613 3037 case TMR_TARGET_WARM_RESET:
c66ac9db
NB		 3038 tmr->response = TMR_FUNCTION_REJECTED;
3039 break;
5c6cd613 3040 case TMR_TARGET_COLD_RESET:
c66ac9db
NB		 3041 tmr->response = TMR_FUNCTION_REJECTED;
3042 break;
c66ac9db 3043 default:
6708bb27 3044 pr_err("Uknown TMR function: 0x%02x.\n",
c66ac9db
NB		 3045 tmr->function);
3046 tmr->response = TMR_FUNCTION_REJECTED;
3047 break;
3048 }
3049
3050 cmd->t_state = TRANSPORT_ISTATE_PROCESSING;
e3d6f909 3051 cmd->se_tfo->queue_tm_rsp(cmd);
c66ac9db 3052
b7b8bef7 3053 transport_cmd_check_stop_to_fabric(cmd);
c66ac9db
NB		 3054}
3055
af877292
CH		 3056int transport_generic_handle_tmr(
3057 struct se_cmd *cmd)
c66ac9db 3058{
f15e9cd9
NB		 3059 unsigned long flags;
3060
3061 spin_lock_irqsave(&cmd->t_state_lock, flags);
3062 cmd->transport_state |= CMD_T_ACTIVE;
3063 spin_unlock_irqrestore(&cmd->t_state_lock, flags);
3064
af877292
CH		 3065 INIT_WORK(&cmd->work, target_tmr_work);
3066 queue_work(cmd->se_dev->tmr_wq, &cmd->work);
c66ac9db
NB		 3067 return 0;
3068}
af877292 3069EXPORT_SYMBOL(transport_generic_handle_tmr);
Linux kernel - Deliverables
This page took 3.050005 seconds and 5 git commands to generate.